Hanging in the air (8)
I believe the answer is:
hovering
'hanging in the air' is the definition.
('hover' can be a synonym of 'hang in the air')
This is the entire clue.
(Other definitions for hovering that I've seen before include "Hanging over, something threatening say" , "hanging around" , "suspended" , "Remaining in one place in the air" , "Floating in the air, like some craft" .)