Joins a contest (6)
I believe the answer is:
enters
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">joins a contest</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 enters that I've seen before include "Inserts" , "Registers for a competition, say" , "Goes in or records in book" , "Goes inside" , "Records, in a diary say" .)