Bucks' mates (4)
I believe the answer is:
does
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">bucks' mates</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for does that I've seen before include "Suffices" , "some antelopes or deer, perhaps" , "is active" , "herbivores" , "Tricks" .)