Polly, apt to be repetitive (6)

I believe the answer is:

parrot

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'polly' is the definition.
(thesaurus)

I can't explain the remainder of the clue.

(Other definitions for parrot that I've seen before include "Repeat unintelligently" , "Imitative bird" , "Mimic speech like colourful bird" , "Vividly coloured bird" , "Tropical bird, may talk" .)

I've seen this clue in the Evening Standard.

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