Horse color pattern (4)
I believe the answer is:
roan
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">horse color pattern</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for roan that I've seen before include "Horse with a coat of mixed colour" , "Horse with main colour interspersed with hairs of another" , "Two-colour horse" , "Reddish-coloured horse" , "Nora (anag) - horse" .)