XC (6)
I believe the answer is:
ninety
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">xc</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for ninety that I've seen before include "Joe perhaps" , "Minutes in a soccer game" , "Cardinal" , "Four score and ten" , "fair amount" .)