Celebrity directors are right (9)
I believe the answer is:
starboard
'are right' is the definition.
(right side of a ship)
'celebrity directors' is the wordplay.
'celebrity' becomes 'star' (I've seen this before).
'directors' becomes 'board' (I've seen this before).
'star'+'board'='STARBOARD'
(Other definitions for starboard that I've seen before include "Right side of ship or plane" , "Right-hand side of ship while facing forward" , "Literally, the steering side of a vessel" , "One side of a ship" , "right to 14 [YACHTS]" .)