A craft school for youngsters (8,4)

I believe the answer is:

training ship

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'a craft' is the definition.
(training ship is a kind of craft)

'school for youngsters' is the wordplay.
'school' becomes 'training school' (training school is a kind of school).
'for youngsters' becomes 'ship' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'training'+'ship'='TRAINING-SHIP'

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I've seen this clue in The Globe and Mail.

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