The right side leading table (9)
I believe the answer is:
starboard
'the right side' is the definition.
'leading table' is the wordplay.
'leading' becomes 'star' ('star' can be a synonym of 'leading').
'table' becomes 'board' (board is a kind of table**).
'star'+'board'='STARBOARD'
(Other definitions for starboard that I've seen before include "Opposite of port" , "Right-hand side of ship while facing forward" , "Sailor's right" , "right to 14 [YACHTS]" , "Right side at sea" .)