Edgy ballerina bratty - a childish person (4)

I believe the answer is:

baby

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

I cannot understand how the remainder of the clue works.

(Other definitions for baby that I've seen before include "One born" , "Pamper; childish person" , "Bunting" , "-- Oil; -- boom" , "Pet project" .)

I've seen this clue in The Irish Times.

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