Horse of a different color
I believe the answer is:
roan
'horse of a different color' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for roan that I've seen before include "(Horse) white-sprinkled coat" , "Nora (anag) - horse" , "Bay horse with white/grey hairs in its coat" , "Horse - leather" , "Bay spotted" .)