Poem Cyril composed
I believe the answer is:
lyric
'poem' is the definition.
(lyric poem is a kind of poem)
'cyril composed' is the wordplay.
'composed' indicates an anagram.
'cyril' with letters rearranged gives 'LYRIC'.
(Other definitions for lyric that I've seen before include "Song's words" , "Of poetry that expresses thoughts and feelings" , "in musical" , "Short poem of songlike quality" , "Expressing personal feelings" .)