Attempt to find (4)
I believe the answer is:
seek
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">attempt to find</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for seek that I've seen before include "Ask for (permission)" , "Attempt - search" , "Go looking for" , "Try to locate or reach" , "Try to find" .)