Panic with something being used to bring down plane (4)
I believe the answer is:
flap
This clue is a double definition.
'panic' is the first definition.
(getting in a flap is panicking)
'something being used to bring down plane' is the second definition.
(part of a plane)
'with' acts as a link.
(Other definitions for flap that I've seen before include "Fluster" , "Wave up and down - panic" , "State of panic" , "Moving surface on wing" , "Panic; fold" .)