Primate with a long tail (6)
I believe the answer is:
monkey
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">primate with a long tail</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 monkey that I've seen before include "See 10" , "Small primate" , "PS500 (sl.)" , "Mischievous child; primate" , "Any of various long-tailed primates" .)