Connect learner with writing material (4)
I believe the answer is:
link
'connect' is the definition.
(I know that connect can be written as link)
'learner with writing material' is the wordplay.
'learner' becomes 'l' (as in a learner driver with L-plates on their car).
'with' is a charade indicator (letters next to each other).
'writing material' becomes 'ink' (substance for writing with).
'l'+'ink'='LINK'
(Other definitions for link that I've seen before include "Item of mail" , "Connect" , "Physically join" , "Connexion" , "Join together" .)