Fool some bassoonists (3)
I believe the answer is:
ass
'fool' is the definition.
(both can mean a stupid person)
'some bassoonists' is the wordplay.
'some' indicates a hidden word (some of the parts of the word are used).
'ASS' is hidden within 'bassoonists'.
(Other definitions for ass that I've seen before include "Charlie" , "Democratic mascot" , "Quadruped; fool" , "Jennet" , "Pompous fool or beast of burden" .)