Small domestic fowl (6)
I believe the answer is:
bantam
'small domestic fowl' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for bantam that I've seen before include "Boxing weight or feisty fowl" , "Very small - batman (anag)" , "Little clucker" , "Small breed of chicken" , "Domestic fowl; small fighter" .)