Hearsay about piece of corn (3)
I believe the answer is:
ear
'piece of corn' is the definition.
(I've seen this in another clue)
'hearsay about' is the wordplay.
'about' says the answer is hidden in the clue (the clue goes around or about the answer).
'EAR' can be found hidden inside 'hearsay'.
(Other definitions for ear that I've seen before include "Lug (colloq.)" , "Discernment musicians need" , "Heed" , "Part of a cereal plant containing the seeds" , "'Give every man thine ..., but few thy voice'/Hamlet" .)