Engage in a contest (7)
I believe the answer is:
compete
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">engage in a contest</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 compete that I've seen before include "Take part in contest" , "Struggle for victory" , "Take part in hope of winning" , "Contend (for a prize)" , "Contend, vie" .)