Crossword Genius

Chica soon supplanting hard left is accepted (9)

Ross

I believe the answer is:

canonical

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'is accepted' is the definition.
(thesaurus)

I don't understand the remainder of the clue.

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(Other definitions for canonical that I've seen before include "Accepted as being authoritative" , "Standard" .)

I've seen this clue in The Daily Express.
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