Small horses (6)
I believe the answer is:
ponies
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">small 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 ponies that I've seen before include "Small breeds of horse" , "Small horses" , "rides" .)