Central Asian wild ass (6)
I believe the answer is:
onager
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">central asian wild ass</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 onager that I've seen before include "The ass is a strange orange" , "Variety of wild ass found in central Asia" , "Asiatic wild ass" , "The ass might be an odd orange colour" , "Orange Asiatic ass" .)