Rebuked youngster, learner expelled (4)
I believe the answer is:
chid
'rebuked' is the definition.
('chide' can be a synonym of 'rebuke')
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for chid that I've seen before include "Lectured" , "rebuked" , "told off" , "Rated" .)