Wildebeests (4)
I believe the answer is:
gnus
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">wildebeests</span>' is the definition.<br/ ><span class="explanation-format__explanation">('gnu' can be a synonym of 'wildebeest')</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for gnus that I've seen before include "Wildebeests" , "African runners" , "Big game" , "Animals" , "Snug (anag) -- wildebeest" .)