Unemployed superstar, by the sound of it (4)
I believe the answer is:
idle
'unemployed' is the definition.
('idle' is associated in meaning with 'unemployed')
'superstar by the sound of it' is the wordplay.
'superstar' becomes 'idol' (I've seen this before).
'by the sound of it' indicates a 'sounds like' (homophone) clue.
'idol' sounds like 'IDLE'.
(Other definitions for idle that I've seen before include "Turn over" , "Not doing much" , "not working in > lounge" , "Maybe Eric" , "Frivolous" .)