Norma's text, possibly, or line I redirected to Bert (8)
I believe the answer is:
libretto
'norma's text possibly' is the definition.
I can't judge whether this definition defines the answer.
'line i redirected to bert' is the wordplay.
'line' becomes 'l' (used when specifying particular lines from a poem).
'redirected' is an anagram indicator.
'to'+'bert'='tobert'
'tobert' with letters rearranged gives 'bretto'.
'l'+'i'+'bretto'='LIBRETTO'
'or' acts as a link.
Can you help me to learn more?
(Other definitions for libretto that I've seen before include "Book of words of an opera" , "The words of an opera or musical play" , "Opera's words" , "Operatic book" , "Text written for an opera" .)