Football-team quota (6)
I believe the answer is:
eleven
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">football-team quota</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 eleven that I've seen before include "Lowest two-digit prime" , "Prime number" , "Players" , "Football side" , "Cardinal" .)