Spotted pony (5)
I believe the answer is:
pinto
'spotted pony' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for pinto that I've seen before include "Piebald horse (US)" , "H [HORSE]" , "Spotted or piebald horse" , "Mount" , "A piebald pony" .)