Presuppose (6)
I believe the answer is:
assume
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">presuppose</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 assume that I've seen before include "Guess" , "Adopt or take for granted" , "Be arrogant" , "Take on, affect" , "Wrongly take" .)