Spot for a horseshoe (4)
I believe the answer is:
hoof
'spot for a horseshoe' 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" , "in impromptu manner, on this" , "Horny cover of foot" , "Part of animal's foot" , "Kick - dance - part of a horse" .)