Learner just possesses talent (5)
I believe the answer is:
flair
'talent' is the definition.
(I know that flair is a type of talent)
'learner just possesses' is the wordplay.
'learner' becomes 'l' (as in a learner driver with L-plates on their car).
'just' becomes 'fair' (just can mean fair in the sense of showing justice).
'possesses' indicates putting letters inside.
'l' placed inside 'fair' is 'FLAIR'.
(Other definitions for flair that I've seen before include "Natural ability to do something well (5)" , "Stylish talent" , "Faculty" , "Natural talent and aptitude" , "?lan, dash" .)