Air heroes (4)
I believe the answer is:
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">air heroes</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 aces that I've seen before include "Ones or elevens in cards" , "winning points" , "Playing cards with single pips on their faces" , "Expert fliers" , "Winning serves" .)