Crossword Genius

Without assistance from Napoleon! (4)

Ross

I believe the answer is:

solo

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This clue might be a double definition.

'without assistance' is the first definition.
(I've seen this in another clue)

'napoleon' is the second definition.
Although both the answer and definition are singular nouns, I can't see how they can define each other.

'from' acts as a link.

Can you help me to learn more?

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

I've seen this clue in the Evening Standard.
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