Lazily sits back in panel discussion (4)
I believe the answer is:
idle
'lazily sits' is the definition.
I can't judge whether this definition defines the answer.
'back in panel discussion' is the wordplay.
'back' says the letters should be written backwards.
'in' indicates a hidden word.
'eldi' is hidden in the letters of 'panel discussion'.
'eldi' written backwards gives 'IDLE'.
Can you help me to learn more?
(Other definitions for idle that I've seen before include "-- Jack, pantomime character" , "Explosive stuff" , "Good-for-nothing" , "Monty Python team member" , "Unoccupied (time); run (engine) slowly" .)