Crossword Genius

Game with a Napoleonic association (4)

Ross

I believe the answer is:

solo

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'game' is the definition.
(I've seen this before)

I can't explain the remainder of the clue.

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(Other definitions for solo that I've seen before include "Piece for one performer" , "Game for four" , "Unaccompanied flight" , "Go it alone" , "On one's own, unaccompanied" .)

I've seen this clue in the Evening Standard.
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