Horse relatives (5)
I believe the answer is:
asses
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">horse relatives</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for asses that I've seen before include "Donkeys" , "Dolts" , "Braying animals" , "Fools; animals" , "not the most sensible types" .)