Crossword Genius

Presumed to house birds from the east? (4)

Ross

I believe the answer is:

emus

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

'birds from the east?' is the definition.
'emus' can be an answer for 'birds' (emu is a kind of bird). I am unsure of the 'from the east?' bit.

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for emus that I've seen before include "Muse about flightless Australian birds" , "Running birds" , "Largest native Australian birds" , "Aussie birds" , "Large flightless birds of Australia" .)

I've seen this clue in The Mirror.
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