Part of the eye learner (5)
I believe the answer is:
pupil
I believe this clue is a double definition.
'part of the eye' is the first definition.
('pupil' is part of 'eye')
'learner' is the second definition.
(pupil is a kind of learner)
(Other definitions for pupil that I've seen before include "Eye's centre" , "Scholar" , "part of my anatomy" , "Eye hole" , "One being taught" .)