Ungulate feature (4)
I believe the answer is:
hoof
'ungulate feature' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for hoof that I've seen before include "Horny cover of foot" , "Kick - dance - part of a horse" , "Eg, deer's foot" , "Animal foot" , "Ungulate's foot" .)