Gives up about school rules (7)
I believe the answer is:
resigns
'gives up' is the definition.
('resign' can be a synonym of 'give up')
'about school rules' is the wordplay.
'about' indicates putting letters inside.
'school' becomes 'S'.
'rules' becomes 'reigns' (reign can mean to rule or govern).
's' inserted within 'reigns' is 'RESIGNS'.
(Other definitions for resigns that I've seen before include "does the honourable thing" , "Gives up (a post)" , "abdicates" , "Leaves job voluntarily" .)