Mountain goats (6)
I believe the answer is:
ibexes
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">mountain goats</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 ibexes that I've seen before include "Large mountain goats" , "Mountain goats with long curved horns" , "Mountain-dwellers" , "Large wild goats" , "Wild mountain goats with backward-curving horns" .)