Fire at from the air (6)
I believe the answer is:
strafe
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">fire at from the air</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 strafe that I've seen before include "Attack from low-flying aircraft" , "Spray with gunfire" , "Faster (anag.)" , "bombing raid" , "Fire from the air with machine guns" .)