Escape mounted under cover of school timetable (8)
I believe the answer is:
schedule
'timetable' is the definition.
(I know that schedule is a type of timetable)
'escape mounted under cover of school' is the wordplay.
I cannot really understand how this works, but
'school' could be 'sch' (abbreviation) and 'sch' is found in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for schedule that I've seen before include "Timetable of planned events or work" , "Inventory - programme" , "You don't see loafers on this" , "Syllabus" , "List of times when things should happen" .)