We'd mistaken one girl for another (6)

I believe the answer is:

edwina

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'for another' is the definition.
I can't judge whether this defines the answer.

'we'd mistaken one girl' is the wordplay.
'mistaken' indicates anagramming the letters.
'one girl' becomes 'ina' ().
'wed' with letters rearranged gives 'edw'.
'edw'+'ina'='EDWINA'

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(Other definitions for edwina that I've seen before include "-- Currie, Conservative MP from 1983 to 1997" , "Aw, dine out on the girl's name" , "Female" , "Home of the Dukes of Bedford" , "Girl - wed Ian (anag)" .)

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