The celebrity panel is on the right (9)
I believe the answer is:
starboard
'is on the right' is the definition.
(thesaurus)
'the celebrity panel' is the wordplay.
'the celebrity' becomes 'star' (I've seen this before).
'panel' becomes 'board' ('board' can be a synonym of 'panel').
'star'+'board'='STARBOARD'
(Other definitions for starboard that I've seen before include "Right side of ship or plane" , "Ship's right side" , "Sailor's right" , "Right-hand side of ship while facing forward" , "Right side at sea" .)