Attack from the air (6)
'attack from the air' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for strafe that I've seen before include "Bombard" , "Attack with fire from a low-flying plane" , "Attack with machine-guns from the air" , "Attack with machine-gun fire" , "Attack from the air with machine guns" .)
(Other definitions for dive-bomb that I've seen before include "Attack from a rapidly descending plane" , "Aerially attack target" , "Attack from a steep angle" , "Perform a steep aerial attack on (a target)" , "Moved bib (anag.)" .)