Air show maneuver (4)
I believe the answer is:
loop
'air show maneuver' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for loop that I've seen before include "Endless strip of tape" , "the knowledgeable are in it" , "Circular shape of pool" , "Aerobatics manoeuvre" , "Shape formed by a closed curve that does not intersect itself" .)