Bemuse wingless birds (4)
I believe the answer is:
emus
'birds' is the definition.
(emu is a kind of bird)
'bemuse wingless' is the wordplay.
'wingless' says to take the centre (the wings or sides of the letters are removed).
The centre of 'bemuse' is 'EMUS'.
(Other definitions for emus that I've seen before include "Fast, but not high-fliers" , "Largest native Australian birds" , "Large flightless birds of Australia" , "Muse about flightless Australian birds" , "Aussie birds" .)