Nullifies (7)
I believe the answer is:
negates
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">nullifies</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for negates that I've seen before include "Nullifies" , "Counteracts" , "Denies the truth of" , "Repudiates" , "Cancels" .)