Final check?
I believe the answer is:
mate
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">final check?</span>' is the definition.<br/ ><span class="explanation-format__explanation">(checkmate, the final check in a game of chess)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for mate that I've seen before include "Perhaps the wife" , "Chess finale" , "Companion, wife" , "Officer below master on a commercial ship" , "Spouse or informal friend" .)