Youngster announced as captain (3)

I believe the answer is:

kid

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'youngster' is the definition.
(I know that youngster can be written as kid)

I can't explain the rest of the clue.

(Other definitions for kid that I've seen before include "Deceive - child" , "Pretend" , "Schoolboy" , "Soft leather" , "Young animal or child" .)

I've seen this clue in the Evening Standard.

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