A learner, individual without any classmates? (5)
I believe the answer is:
alone
'without any classmates?' is the definition.
'a learner individual' is the wordplay.
'learner' becomes 'l'.
'individual' becomes 'one' (**).
'a'+'l'+'one'='ALONE'
(Other definitions for alone that I've seen before include "Unaccompanied" , "Isolated; exclusively" , "Lacking company, solitary" , "Solo" , "Isolated from others" .)