Of horses (6)
I believe the answer is:
equine
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">of horses</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 equine that I've seen before include "Horse or donkey, perhaps" , "like knight?" , "Horse-like" , "Horsey" , "Resembling a horse" .)