Part of song Cyril botched (5)
I believe the answer is:
lyric
'part of song' is the definition.
('lyric' is part of 'song')
'cyril botched' is the wordplay.
'botched' is an anagram indicator.
'cyril' anagrammed gives 'LYRIC'.
(Other definitions for lyric that I've seen before include "Song's text" , "Text of a popular song" , "Poem - verse - London theatre" , "Short poem of songlike quality" , "Expressing poetical emotions" .)