Crossword Genius

Not a Mr mistaken for a Mrs (6)

Ross

I believe the answer is:

matron

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'a mrs' is the definition.
The answer and definition can be both people as well as being singular nouns.
Maybe they are linked in a way I don't understand?

'not a mr mistaken' is the wordplay.
'mistaken' is an anagram indicator.
'not'+'a'+'mr'='notamr'
'notamr' is an anagram of 'MATRON'.

'for' acts as a link.

Can you help me to learn more?

(Other definitions for matron that I've seen before include "Nurses' manager" , "Senior nurse" , "school officer" , "Chief nurse" , "Old woman" .)

I've seen this clue in The Globe and Mail.
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