Crossword Genius

Break outside school, as a sort of discipline (9)

Ross

I believe the answer is:

restraint

'a sort of discipline' is the definition.

'break outside school' is the wordplay.
'break' becomes 'rest' (rest is a kind of break).
'outside' is an insertion indicator.
'school' becomes 'train' (training is a kind of schooling).
'rest' going around 'train' is 'RESTRAINT'.

'as' is the link.

(Other definitions for restraint that I've seen before include "It keeps someone or something under control" , "Start rain as an impediment" , "Reserve" , "Curb" , "controlling influence" .)

I've seen this clue in The Guardian.
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