Crossword Genius

Aussie birds missing flight? (4)

Ross

I believe the answer is:

emus

I'm a little stuck... Click here to teach me more about this clue!

'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" .)

I've seen this clue in The Sun.
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