Hearsay about body part (3)
I believe the answer is:
ear
'body part' is the definition.
(ear is a part of the body)
'hearsay about' is the wordplay.
'about' indicates a hidden word (the clue goes around or about the answer).
'EAR' is hidden within 'hearsay'.
(Other definitions for ear that I've seen before include "Organ inside heart" , "Spike of, eg, corn" , "Part of corn plant" , "Seed-bearing spike" , "'Give every man thine ..., but few thy voice'/Hamlet" .)