Struggling to drop son for schooling (8)

I believe the answer is:

training

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'for schooling' is the definition.
(training is a kind of schooling)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for training that I've seen before include "Disciplined preparation" , "Vocational education" , "Regime" , "Preparing for competition or career" , "drill" .)

I've seen this clue in The Hindu.

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