A trying game? (5)

I believe the answer is:

rugby

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'game?' is the definition.
(I know that rugby is a type of Rugby football)

I can't explain the rest of the clue.

(Other definitions for rugby that I've seen before include "Game with oval ball" , "Public school - sport" , "The 13-a-side game" , "Sport with oval ball" , "Famous public school" .)

I've seen this clue in the Evening Standard.

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