Plan faster attack from the air (6)
I believe the answer is:
strafe
'attack from the air' is the definition.
(I've seen this before)
'plan faster' is the wordplay.
'plan' indicates an anagram (I've seen this in other clues).
'faster' anagrammed gives 'STRAFE'.
(Other definitions for strafe that I've seen before include "Attack with machine-gun from the air" , "attack with flying arms" , "bombing raid" , "Pepper" , "Attack with machine-guns from the air" .)