Panel discussion is about return of jobless (4)
I believe the answer is:
idle
'jobless' is the definition.
(thesaurus)
'panel discussion is about return' is the wordplay.
'about' indicates a hidden word.
'return' says the letters should be written in reverse.
'eldi' is hidden within 'panel discussion is'.
'eldi' backwards is 'IDLE'.
'of' is the link.
(Other definitions for idle that I've seen before include "having been taken from service" , "At rest" , "Avoiding work, lazy" , "Lazy - vain" , "Inactive - lied (anag)" .)