Australian runners entertained by dance music (4)
I believe the answer is:
emus
'australian runners' is the definition.
'entertained by dance music' is the wordplay.
'entertained by' indicates a hidden word (the clue hosts or entertains the answer).
'EMUS' is hidden in the letters of 'dance music'.
(Other definitions for emus that I've seen before include "Largest native Australian birds" , "Large flightless birds of Australia" , "Running birds" , "Muse about flightless Australian birds" , "Fast, but not high-fliers" .)