Seek an answer (3)
I believe the answer is:
ask
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">seek an answer</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 ask that I've seen before include "Seek an answer" , "Put a question" , "Invite (to a party)" , "Request, invite" , "Something demanded" .)