Crossword Genius

History-making game? (8)

Ross

I believe the answer is:

napoleon

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'game?' is the definition.
(I know that Napoleon is a card game)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for napoleon that I've seen before include "In France, former sovereign" , "dictator" , "Frenchman known as The Little Corporal" , "French general and emperor" , "Old French coin" .)

I've seen this clue in the Evening Standard.
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