Solo game? (8)

I believe the answer is:

napoleon

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This might be a double definition.

'solo' is the first definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.

'game?' is the second definition.
(thesaurus)

Can you help me to learn more?

(Other definitions for napoleon that I've seen before include "Head pig on Animal Farm" , "Ex-dictator" , "Cake" , "Gold twenty franc piece" , "A pig farmer was chased by" .)

I've seen this clue in the Evening Standard.

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