Student in the teacher's eye (5)
I believe the answer is:
pupil
This clue could be a double definition.
'student in the teacher's' is the first definition.
'pupil' can be an answer for 'student' (pupil can mean a student at a school). I am not sure about the 'in the teacher's' bit.
'eye' is the second definition.
(thesaurus)
Can you help me to learn more?
(Other definitions for pupil that I've seen before include "feature in "Observer"?" , "Scholar" , "One under instruction" , "Dark centre of the eye" , "Eye opening" .)