(n) 1. The incombustible residue, fused into an irregular lump, that remains after the combustion of coal.
2. A partially vitrified brick or a mass of bricks fused together.
3. An extremely hard burned brick.
4. Vitrified matter expelled by a volcano.
A sour note in a musical performance: hit a clinker.
A mistake; a blunder.
Something of inferior quality; a conspicuous failure: a clinker of a show.
6. Chiefly British. Something admirable or first-rate.