The bird is flown (4)
I believe the answer is:
kite
I believe this clue is a double definition.
'the bird' is the first definition.
(kite is a kind of bird)
'is flown' is the second definition.
(I've seen this before)
(Other definitions for kite that I've seen before include "Raptor - flying toy" , "aeroplane" , "Wind-borne frame" , "It flies with string attached" , "A flying toy or sea bird" .)