Describing the smallest note written by a learner (7)
I believe the answer is:
minimal
'describing the smallest' is the definition.
I can't tell whether this definition defines the answer.
'note written by a learner' is the wordplay.
'note' becomes 'minim' (type of musical note).
'written by' is a charade indicator (letters next to each other).
'learner' becomes 'l' (as in a learner driver with L-plates on their car).
'minim'+'a'+'l'='MINIMAL'
Can you help me to learn more?
(Other definitions for minimal that I've seen before include "Token" , "Least possible; negligible" , "Very small, the least possible (7)" , "Of the least possible size" , "Of a smallest amount" .)