Game with a Napoleonic association (4)
I believe the answer is:
solo
'game' is the definition.
(I've seen this before)
I can't explain the remainder of the clue.
Can you help me to learn more?
(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" .)