Aerial maneuver (4)
I believe the answer is:
loop
'aerial maneuver' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for loop that I've seen before include "Endless strip of tape" , "(Of aircraft) make a circle vertically" , "not informed one's out of it" , "Aircraft manoeuvre; encircle" , "flying stunt" .)