A child of three? (7)

I believe the answer is:

triplet

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'three?' is the definition.
('triplet' can be a synonym of 'three')

I can't explain the remainder of the clue.

(Other definitions for triplet that I've seen before include "Baby with two similar siblings" , "sibling?" , "One of three born at the same time" , "One of several arriving together" , "One of three at the same birth" .)

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