Castrated male chicken (5)
I believe the answer is:
capon
'castrated male chicken' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for capon that I've seen before include "fowl fattened for pot" , "Castrated male chicken" , "Emasculated fowl" , "Castrated fowl, for eating" , "for lunch, perhaps" .)