Move (wings) up and down (4)
I believe the answer is:
flap
'move wings up and down' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for flap that I've seen before include "State of agitation" , "Be agitated; hinged piece" , "Wave up and down - panic" , "State of panic" , "Excitement" .)