diff --git a/src/terminal/apc/glyph/Glossary.zig b/src/terminal/apc/glyph/Glossary.zig
index f2b102d8b..316d36ae6 100644
--- a/src/terminal/apc/glyph/Glossary.zig
+++ b/src/terminal/apc/glyph/Glossary.zig
@@ -24,6 +24,9 @@ pub const empty: Glossary = .{ .entries = .empty };
 /// Errors that can occur while registering a glossary entry.
 pub const RegisterError = Allocator.Error || error{OutOfNamespace};
 
+/// Errors that can occur while clearing glossary entries.
+pub const ClearError = error{OutOfNamespace};
+
 /// The set of entries in the glossary keyed by the codepoint.
 ///
 /// The array hash map preserves insertion order and has O(N)
@@ -87,7 +90,7 @@ pub fn delete(
     self: *Glossary,
     alloc: Allocator,
     cp: u21,
-) error{OutOfNamespace}!void {
+) ClearError!void {
     if (!isPrivateUse(cp)) return error.OutOfNamespace;
     const kv = self.entries.fetchOrderedRemove(cp) orelse return;
     var entry = kv.value;
diff --git a/src/terminal/apc/glyph/execute.zig b/src/terminal/apc/glyph/execute.zig
index 6a695383b..14f30686e 100644
--- a/src/terminal/apc/glyph/execute.zig
+++ b/src/terminal/apc/glyph/execute.zig
@@ -32,7 +32,8 @@ pub fn execute(
     return switch (req.*) {
         .support => .{ .support = .{ .fmt = supported_formats } },
         .register => |reg| register(alloc, glossary, reg),
-        .query, .clear => @panic("TODO"),
+        .clear => |clr| clear(alloc, glossary, clr),
+        .query => @panic("TODO"),
     };
 }
 
@@ -82,6 +83,25 @@ fn registerFallible(
     return cp;
 }
 
+fn clear(
+    alloc: Allocator,
+    glossary: *Glossary,
+    clr: Request.Clear,
+) ?Response {
+    if (clr.get(.cp)) |cp| {
+        glossary.delete(alloc, cp) catch |err| return .{ .clear = .{
+            .status = .err,
+            .reason = switch (err) {
+                error.OutOfNamespace => "out_of_namespace",
+            },
+        } };
+    } else {
+        glossary.clearAndFree(alloc);
+    }
+
+    return .{ .clear = .{} };
+}
+
 fn testParse(alloc: Allocator, data: []const u8) !Request {
     var parser = request.CommandParser.init(alloc, 1024 * 1024);
     defer parser.deinit();
@@ -172,3 +192,67 @@ test "execute register reports malformed payload" {
     }, execute(alloc, &glossary, &req).?);
     try testing.expect(!glossary.contains(0xE0A0));
 }
+
+test "execute clear removes all glyphs" {
+    const testing = std.testing;
+    const alloc = testing.allocator;
+
+    var glossary: Glossary = .empty;
+    defer glossary.deinit(alloc);
+
+    var reg1 = try testParse(alloc, "r;cp=e0a0;AAAAAAAAAAAAAA==");
+    defer reg1.deinit(alloc);
+    _ = execute(alloc, &glossary, &reg1);
+
+    var reg2 = try testParse(alloc, "r;cp=e0a1;AAAAAAAAAAAAAA==");
+    defer reg2.deinit(alloc);
+    _ = execute(alloc, &glossary, &reg2);
+
+    var req = try testParse(alloc, "c");
+    defer req.deinit(alloc);
+
+    try testing.expectEqual(Response{ .clear = .{} }, execute(alloc, &glossary, &req).?);
+    try testing.expect(!glossary.contains(0xE0A0));
+    try testing.expect(!glossary.contains(0xE0A1));
+}
+
+test "execute clear removes one glyph" {
+    const testing = std.testing;
+    const alloc = testing.allocator;
+
+    var glossary: Glossary = .empty;
+    defer glossary.deinit(alloc);
+
+    var reg1 = try testParse(alloc, "r;cp=e0a0;AAAAAAAAAAAAAA==");
+    defer reg1.deinit(alloc);
+    _ = execute(alloc, &glossary, &reg1);
+
+    var reg2 = try testParse(alloc, "r;cp=e0a1;AAAAAAAAAAAAAA==");
+    defer reg2.deinit(alloc);
+    _ = execute(alloc, &glossary, &reg2);
+
+    var req = try testParse(alloc, "c;cp=e0a0");
+    defer req.deinit(alloc);
+
+    try testing.expectEqual(Response{ .clear = .{} }, execute(alloc, &glossary, &req).?);
+    try testing.expect(!glossary.contains(0xE0A0));
+    try testing.expect(glossary.contains(0xE0A1));
+}
+
+test "execute clear rejects non-PUA" {
+    const testing = std.testing;
+    const alloc = testing.allocator;
+
+    var glossary: Glossary = .empty;
+    defer glossary.deinit(alloc);
+
+    var req = try testParse(alloc, "c;cp=41");
+    defer req.deinit(alloc);
+
+    try testing.expectEqual(Response{
+        .clear = .{
+            .status = .err,
+            .reason = "out_of_namespace",
+        },
+    }, execute(alloc, &glossary, &req).?);
+}