Tutor in break makes check (9)
I believe the answer is:
restraint
'check' is the definition.
(I've seen this before)
'tutor in break' is the wordplay.
'tutor' becomes 'train' (I've seen this before).
'in' means one lot of letters goes inside another.
'break' becomes 'rest' (a rest is taking a break).
'train' inserted inside 'rest' is 'RESTRAINT'.
'makes' acts as a link.
(Other definitions for restraint that I've seen before include "Self-discipline" , "Check" , "Limiting device" , "Self-control" , "Control, restriction, curtailment" .)