Red crest on the head of the domestic fowl (7)
I believe the answer is:
coxcomb
'red crest on the head of the domestic fowl' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for coxcomb that I've seen before include "Conceited dandy" , "Vain or conceited person" , "Fop - fleshy outgrowth on a cockerel's head" , "Red crest on the head of the domestic fowl" , "foppish man" .)