Bemused with Australian creatures (4)
I believe the answer is:
emus
'australian creatures' is the definition.
'emus' can be an answer for 'creatures' (emu is a kind of creature). I also know that 'australian' relates to this answer.
'bemused with' is the wordplay.
'with' says the answer is hidden in the clue.
'EMUS' is hidden in the letters of 'bemused'.
(Other definitions for emus that I've seen before include "Fast, but not high-fliers" , "Running birds" , "laboratory units" , "Muse about flightless Australian birds" , "Large flightless birds of Australia" .)