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' (abbreviation for bishop in chess).
'surprisingly' is an anagram indicator (a surprising ordering of the letters).
'dominant' with letters rearranged gives 'adminton'.
'b'+'adminton'='BADMINTON'
'in' is the 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" .)