Bishop surprisingly dominant in game (9)
I believe the answer is:
badminton
'game' is the definition.
(badminton is a kind of game)
'bishop surprisingly dominant' is the wordplay.
'bishop' becomes 'B' (chess abbreviation).
'surprisingly' indicates an anagram (a surprising ordering of the letters).
'dominant' is an anagram of 'adminton'.
'b'+'adminton'='BADMINTON'
'in' acts as a link.
(Other definitions for badminton that I've seen before include "Racket game with shuttlecock" , "Racket sport" , "Racquet sport" , "Court game" , "in which rackets are involved" .)