Aussie birds missing flight? (4)
I believe the answer is:
emus
'aussie birds' is the definition.
(I've seen this in another clue)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for emus that I've seen before include "Large flightless birds of Australia" , "laboratory units" , "Largest native Australian birds" , "Muse about flightless Australian birds" , "Fast, but not high-fliers" .)