Crossword Genius

Unchanged in dialect after reinterpretation (9)

Ross

I believe the answer is:

identical

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'unchanged' is the definition.
Both the definition and answer are adjectives. Perhaps you can see a link between them that I can't see?

'in dialect after reinterpretation' is the wordplay.
'in dialect' can be anagrammed to 'IDENTICAL'.
However, I am not clear how this is indicated.

Can you help me to learn more?

(Other definitions for identical that I've seen before include "Duplicate" , "as B and B" , "Impossible to tell apart" , "not distinguished" , "uniform" .)

I've seen this clue in The Independent.
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