It expanded what was written by Dante, among others (7)
I believe the answer is:
italian
'it expanded what was written by dante among others' is the definition.
The definition suggests a singular noun which matches the answer.
This is the entire clue.
Can you help me to learn more?
(Other definitions for italian that I've seen before include "Mediterranean language" , "Southern European" , "of national significance" , "A film was made about such a job" , "This European is anti Lia, oddly" .)