Stinging flier (4)
I believe the answer is:
wasp
'stinging flier' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for wasp that I've seen before include "Being in the American elite" , "Swap for a stinging insect" , "Middle class American" , "type dominant across the pond" , "Stingy type" .)