See boss, cunning man on board (10)
I believe the answer is:
archbishop
'see boss' is the definition.
(a bishop is in charge of an ecclesiastical see)
'cunning man on board' is the wordplay.
'cunning' becomes 'arch' (I've seen this before).
'man on board' becomes 'bishop' (chess).
'arch'+'bishop'='ARCHBISHOP'
(Other definitions for archbishop that I've seen before include "man of the church" , "Senior prelate" , "Senior churchman" , "ecclesiastical dignitary?" , "primate" .)