Reject as false (4)
I believe the answer is:
deny
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">reject as false</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 deny that I've seen before include "Refuse to admit (something)" , "Refuse to acknowledge" , "Refuse to grant" , "Declare non-existent" , "Refuse to give" .)