Said star is not working (4)
I believe the answer is:
idle
'is not working' is the definition.
(I've seen this before)
'said star' is the wordplay.
'said' indicates a 'sounds like' (homophone) clue.
'star' becomes 'idol' (idol is a kind of star).
'idol' sounds like 'IDLE'.
(Other definitions for idle that I've seen before include "Monty Python team member" , "loiter aimlessly" , "Not busy" , "Circus entertainer" , "-- Jack, pantomime character" .)