Bird that flies without wings (4)
I believe the answer is:
kite
This clue is a double definition.
'bird' is the first definition.
(kite is a kind of bird)
'that flies without wings' is the second definition.
(as in flying a kite)
(Other definitions for kite that I've seen before include "Toy; aircraft (dated)" , "flyer" , "Kind of toy flown on string" , "plane" , "High as a - -" .)