Small chimpanzee (6)
I believe the answer is:
bonobo
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">small chimpanzee</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for bonobo that I've seen before include "our nearest relative" , "Small chimpanzee" .)