Equine shade (4)
I believe the answer is:
roan
'equine shade' 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 with a coat of mixed colour" , "Red-coloured horse" , "Nora (anag) - horse" , "Reddish-coloured horse" , "Bay horse with white/grey hairs in its coat" .)