Cyril's rewritten words (6)
I believe the answer is:
lyrics
'words' is the definition.
(I've seen this in another clue)
'cyril's rewritten' is the wordplay.
'rewritten' indicates anagramming the letters.
'cyrils' with letters rearranged gives 'LYRICS'.
(Other definitions for lyrics that I've seen before include "Words used in songs" , "Words of a pop song" , "Short song-like poems" , "words to perform" , "words in numbers" .)