Charge student to touch (4)
I believe the answer is:
feel
'touch' is the definition.
(feeling is a kind of touching)
'charge student' is the wordplay.
'charge' becomes 'fee' (fee is a kind of charge**).
'student' becomes 'l' (as in L-plates for learner drivers).
'fee'+'l'='FEEL'
'to' acts as a link.
(Other definitions for feel that I've seen before include "Be aware of - texture" , "Perceive by touch" , "Consider" , "Instinct" , "Perceive, sense" .)