For Cyril it's composition — others note his words (8)
I believe the answer is:
lyricist
'composition others note his words' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'for cyril it's' is the wordplay.
'cyril it's' can be anagrammed to 'LYRICIST'.
However, I'm not clear how this is indicated.
Can you help me to learn more?
(Other definitions for lyricist that I've seen before include "librettist" , "Book writer" , "Person who writes words for songs" , "Musical words writer" , "The one who writes the words for songs" .)