Opening for a student (5)
I believe the answer is:
pupil
I believe this is a double definition.
'opening' is the first definition.
(pupil is a kind of opening)
'a student' is the second definition.
('pupil' can be a synonym of 'student')
'for' is the link.
(Other definitions for pupil that I've seen before include "Learner at educational institution" , "I learn" , "One being taught" , "Schoolchild; part of eye" , "One studying" .)