Hearsay about organ (3)
I believe the answer is:
ear
'organ' is the definition.
(ear is a kind of organ)
'hearsay about' is the wordplay.
'about' says the answer is hidden in the clue (the clue goes around or about the answer).
'EAR' is hidden in the letters of 'hearsay'.
(Other definitions for ear that I've seen before include "Hammer in this" , "Discernment musicians need" , "Organ involved with balance" , "Seed container" , "Seed-bearing spike" .)