Cyril butchered words of a song (5)
I believe the answer is:
lyric
'words of a song' is the definition.
(I've seen this before)
'cyril butchered' is the wordplay.
'butchered' indicates anagramming the letters (I've seen this in other clues).
'cyril' with letters rearranged gives 'LYRIC'.
(Other definitions for lyric that I've seen before include "Expressing personal feelings" , "Melodic" , "(Of poetry) expressing emotion" , "Part of a libretto" , "Cyril (anag.)" .)