Fatted fowl (5)
I believe the answer is:
capon
'fatted fowl' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for capon that I've seen before include "one fattened specially" , "Castrated cock fattened for eating" , "Castrated male chicken" , "Castrated cock fowl" , "for lunch, perhaps" .)