Young hen (6)
I believe the answer is:
pullet
'young hen' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for pullet that I've seen before include "Chicken under one year old" , "Young domestic fowl" , "Young chicken" , "Domestic hen less than 1 year old" , "A young domestic hen less than one year old" .)