A game anyone may be for (6)

I believe the answer is:

tennis

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'a game' is the definition.
(I know that tennis is a type of court game)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for tennis that I've seen before include "Ball-game" , "Racket sport" , "Sent in strangely to play the game" , "Game for two or four" , "Court-based sport" .)

I've seen this clue in the Evening Standard.

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