Wild goat (4)
I believe the answer is:
ibex
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">wild goat</span>' is the definition.<br/ ><span class="explanation-format__explanation">(ibex is a kind of wild goat)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for ibex that I've seen before include "Wild goat with large recurved horns" , "Sure-footed type" , "Mountain animal" , "Mountain-goat" , "being nimble-footed" .)