Sense of hearing (3)
I believe the answer is:
ear
'sense of hearing' is the definition.
(ear is a kind of sense of hearing)
This is the entire clue.
(Other definitions for ear that I've seen before include "Organ involved with balance" , "Part of a cereal plant containing the seeds" , "'Give every man thine ..., but few thy voice'/Hamlet" , "Aural appendage" , "Discernment musicians need" .)