Kasparov's game (5)
I believe the answer is:
chess
'kasparov's game' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for chess that I've seen before include "Board game of 13, 16 and 21" , "Game with kings and queens" , "Musical - board game" , "In which two bishops will participate" , "show" .)