Equine animals (6)
I believe the answer is:
horses
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">equine animals</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for horses that I've seen before include "Equines" , "Hoofed mammals (which go with 19 4)" , "Eg, stallions" , "Steeds" , "Equine beasts" .)