The Casabianca kid? (3)

I believe the answer is:

boy

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'kid?' is the definition.
(boy is a kind of kid)

I don't understand the rest of the clue.

(Other definitions for boy that I've seen before include "Son" , "SECOND HALF OF 14" , "Male child" , "Youthful male" , "Lad" .)

I've seen this clue in the Evening Standard.

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