Big baboon (8)
I believe the answer is:
mandrill
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">big baboon</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 mandrill that I've seen before include "African baboon with red and blue muzzle and hindquarters" , "Colourful baboon in the damn rill" , "Large baboon" , "Ape" , "West African baboon-like primate" .)