Some of the chosen live on in audio (4)
I believe the answer is:
echo
'live on in audio' is the definition.
'some of the chosen' is the wordplay.
'some of' indicates a hidden word.
'ECHO' is hidden within 'the chosen'.
(Other definitions for echo that I've seen before include "Close imitation" , "Be suggestive of" , "One who slavishly copies" , "The distant sound" , "call back" .)