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Master coming to a mistaken conclusion? (3)

Ross

I believe the answer is:

man

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

'master coming to a' is the wordplay.
'master' becomes 'M' (common abbreviation eg MA, Master of Art).
'coming to' is a charade indicator (letters next to each other).
'a' becomes 'an'.
'm'+'an'='MAN'

Can you help me to learn more?

(Other definitions for man that I've seen before include "us?" , "Vassal; chess piece" , "See 24" , "race" , "Adult human male" .)

I've seen this clue in the Evening Standard.
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