Perspicacity unwelcome in performing musicians? (9)
I believe the answer is:
sharpness
'perspicacity' is the definition.
The answer and definition can be both human attributes as well as being singular nouns.
Perhaps there's a link between them I don't understand?
I don't understand how the rest of the clue works.
(Other definitions for sharpness that I've seen before include "Being quick to perceive" , "Acuity; Severn port" , "faulty intonation" , "Clarity" .)