Ungulate's foot (4)
I believe the answer is:
hoof
'ungulate's foot' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for hoof that I've seen before include "Eg, deer's foot" , "Kick - dance - part of a horse" , "Foot of ungulate" , "in impromptu manner, on this" , "Kick powerfully" .)