Start off banquet as one at table (4)
I believe the answer is:
east
'one at table' is the definition.
(one of the four players at a bridge table)
'start off banquet' is the wordplay.
'start off' means to remove the first letter (I've seen 'starting off' mean this (the starting letter is removed)).
'banquet' becomes 'feast' (synonyms).
'feast' with its first letter removed is 'EAST'.
'as' acts as a link.
(Other definitions for east that I've seen before include "Sunrise direction" , "Direction of the rising sun" , "Direction taken when going from the US towards Ireland" , "the way the Wise Men came from" , "course" .)