Narrate in unoriginal style (6)

I believe the answer is:

retell

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'narrate' is the definition.
(thesaurus)

I can't explain the rest of the clue.

(Other definitions for retell that I've seen before include "Repeat" , "Once again inform" , "Once more recount story" , "Narrate again" .)

I've seen this clue in the Evening Standard.

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