Card game — emperor (8)

I believe the answer is:

napoleon

I believe this is a double definition.

'card game' is the first definition.
(I know that Napoleon is a type of card game)

'emperor' is the second definition.
(I know that Napoleon is a emperor)

(Other definitions for napoleon that I've seen before include "Ex-dictator" , "French VIP" , "leader in France, once" , "Open loan to the French general. strangely" , "Gold twenty franc piece" .)

I've seen this clue in The Guardian.

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