Line with repetition, not on for learned people (8)
I believe the answer is:
literati
'learned people' is the definition.
(I've seen this before)
'line with repetition not on' is the wordplay.
'line' becomes 'l' (used when specifying particular lines from a poem).
'with' is a charade indicator (letters next to each other).
'repetition' becomes 'iteration' (to iterate something is to repeat it).
'not' is a deletion indicator.
'iteration' with 'on' removed is 'iterati'.
'l'+'iterati'='LITERATI'
'for' acts as a link.
(Other definitions for literati that I've seen before include "Learned people, men of letters" , "Well-read types" , "educated set" , "The well-read intelligentsia" , "Educated book readers" .)