(slang) A sour note in a musical performance.
“You see, man, Prez has the technical anxieties of a money-making musician, he’s the only one who’s well dressed, see him grow worried when he blows a clinker, but the leader, that cool cat, tells him not to worry and just blow and blow—the mere sound and serious exuberance of the music is all he cares about.
Definition from The American Heritage® Dictionary of the English Language, 4th Edition (via Wordnik)
metonymic / autodidactic 
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