Said superstar is out of work (4)
I believe the answer is:
idle
'out of work' is the definition.
(I've seen this before)
'said superstar' is the wordplay.
'said' indicates a 'sounds like' (homophone) clue.
'superstar' becomes 'idol' (idol can mean a celebrity).
'idol' is a homophone of 'IDLE'.
'is' is the link.
(Other definitions for idle that I've seen before include "Eric, perhaps" , "loiter aimlessly" , "Explosive stuff" , "At leisure" , "At rest" .)