XL (5)
I believe the answer is:
forty
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">xl</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for forty that I've seen before include "Two score" , "-- winks, a short sleep" , "number of penitential days" , "When life begins" , "Two-score" .)