Moves through the air over the stage (5)
I believe the answer is:
flies
'the stage' is the definition.
(thesaurus)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for flies that I've seen before include "Trouser zip area -- travels through the air" , "Insects; passes swiftly" , "Insects; goes quickly" .)