Air hero (3)
I believe the answer is:
ace
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">air hero</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 ace that I've seen before include "Top playing card" , "Brilliant" , "star" , "one among a set of diamonds" , "smashing" .)