Birds making some fine music (4)
I believe the answer is:
emus
'birds' is the definition.
(emu is a kind of bird)
'some fine music' is the wordplay.
'some' says the answer is hidden in the clue (some of the parts of the word are used).
'EMUS' is hidden in the letters of 'fine music'.
'making' acts as a link.
(Other definitions for emus that I've seen before include "Aussie birds" , "Large flightless birds of Australia" , "Muse about flightless Australian birds" , "Running birds" , "Largest native Australian birds" .)