Bear in the air (4)
I believe the answer is:
ursa
'bear in the air' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for ursa that I've seen before include "(In the sky) Major or Minor" , "- Major, - Minor, prominent constellations" , "(& 19 across) Plough constellation" , "Bear (constellation)" , "'Major and Minor, constellations (4)'" .)