Sense of fair play (13)
I believe the answer is:
sportsmanship
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">sense of fair play</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for sportsmanship that I've seen before include "Sense of fair play" , "Equity" , "Playing fair, being a good loser, etc" , "Playing the game" .)