Point about learner being dunce (4)
I believe the answer is:
dolt
'dunce' is the definition.
(I've seen this before)
'point about learner' is the wordplay.
'point' becomes 'dot' ('dot' can be a synonym of 'point'**).
'about' indicates putting letters inside.
'learner' becomes 'l'.
'dot' enclosing 'l' is 'DOLT'.
'being' is the link.
(Other definitions for dolt that I've seen before include "Slow-witted type" , "Dullard" , "Dimwit" , "dope" , "Slow-witted person" .)