A refusal from Napoleon soon (4)

I believe the answer is:

anon

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'soon' is the definition.
(synonyms)

'a refusal from napoleon' is the wordplay.
'refusal' becomes 'no'.
'from' means one lot of letters go next to another.
'napoleon' becomes 'n' (this could be a standard abbreviation which I don't know about).
'a'+'no'+'n'='ANON'

Can you help me to learn more?

(Other definitions for anon that I've seen before include "Mystery writer" , "Having no known name" , "Of unknown authorship" , "Presently - unattributed" , "Nameless - presently" .)

I've seen this clue in The Sun.

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