Learner is not a little flexible (7)
I believe the answer is:
lissome
'flexible' is the definition.
(I've seen this before)
'learner is not a little' is the wordplay.
'learner' becomes 'l'.
'not a little' becomes 'some'.
'l'+'is'+'some'='LISSOME'
(Other definitions for lissome that I've seen before include "Moving supply" , "So smile, being agile and lithe" , "pliable" , "Willowy" , "Lithe; nimble" .)