Presumed to house birds from the east? (4)
I believe the answer is:
emus
'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" .)