Defeat with cunning (6)
I believe the answer is:
outfox
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">defeat with cunning</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 outfox that I've seen before include "Be too clever for, like Reynard (6)" , "Be too clever for, in vulpine mode" , "Surpass in art" , "Beat by cunning" , "Cunningly get the better of" .)