After school, avoid going over timetable (8)
I believe the answer is:
schedule
'timetable' is the definition.
(I know that timetable can be written as schedule)
'after school avoid going over' is the wordplay.
'after' means one lot of letters go next to another.
'school' becomes 'sch' (abbreviation).
'avoid' becomes 'elude' (eluding is a kind of avoiding).
'going over' is a reversal indicator.
'elude' in reverse letter order is 'edule'.
'sch'+'edule' is 'SCHEDULE'.
(Other definitions for schedule that I've seen before include "You don't see loafers on this" , "Agenda" , "Timetable of planned events or work" , "Plan for an activity" , "List of times and places for events" .)