Eccentric exuberant replacing stuffing in dolly (5)

I believe the answer is:

dotty

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'eccentric' is the definition.
(I've seen this before)

I don't understand how the rest of the clue works.

(Other definitions for dotty that I've seen before include "like a Dalmatian?" , "Barking" , "Feeble-minded" , "Eccentric, slightly mad" , "Slightly crazy" .)

I've seen this clue in The Telegraph.

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