Hang in the air (5)
I believe the answer is:
hover
'hang in the air' is the definition.
(synonyms)
This is all the clue.
(Other definitions for hover that I've seen before include "Wait around (like a kestrel)" , "Hang in the air or waver" , "Be poised" , "Float above in the air, perhaps a craft" , "Remain in one spot in the air" .)