Outsmart (6)
I believe the answer is:
outwit
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">outsmart</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I know that outsmart can be written as outwit)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for outwit that I've seen before include "Mentally get the better of" , "Outsmart" , "Defeat by superior ingenuity" , "Outfox" , "Intellectually get the better of" .)