Hearsay about part of the head (3)
I believe the answer is:
ear
'part of the head' is the definition.
('ear' is part of 'head')
'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 "Organ of hearing" , "Bit of corn" , "Fruiting head of corn" , "Appreciation of sounds" , "Discernment musicians need" .)