Strategy game (5)
I believe the answer is:
chess
'strategy game' is the definition.
(chess is a game of strategy)
This is the entire clue.
(Other definitions for chess that I've seen before include "Pieces moved in this" , "Sixteen-men-a-side game" , "Board game of 13, 16 and 21" , "Ancient war game whose name may have derived for the Persian for 'king'" , "show" .)