Brilliant set of directors, right? (9)
I believe the answer is:
starboard
'right?' is the definition.
(right side of a ship)
'brilliant set of directors' is the wordplay.
'brilliant' becomes 'star' (star can mean brilliant eg star performer).
'set of directors' becomes 'board' (board of directors).
'star'+'board'='STARBOARD'
(Other definitions for starboard that I've seen before include "Opposite of port" , "Right-hand side of ship while facing forward" , "right to 14 [YACHTS]" , "Ship's right side" , "Literally, the steering side of a vessel" .)