Able to read line and repeat (8)
I believe the answer is:
literate
'able to read' is the definition.
(I've seen this in another clue)
'line and repeat' is the wordplay.
'line' becomes 'l' (used when specifying particular lines from a poem).
'and' is a charade indicator (letters next to each other).
'repeat' becomes 'iterate' (synonyms).
'l'+'iterate'='LITERATE'
(Other definitions for literate that I've seen before include "Well versed in books" , "Erudite" , "Scholarly" , "Well-read" , "well expressed" .)