It's as poetic as Cyril can be (5)
I believe the answer is:
lyric
'it's as poetic' is the definition.
I can't tell whether this definition defines the answer.
'cyril can be' is the wordplay.
'can be' indicates an anagram.
'cyril' with letters rearranged gives 'LYRIC'.
'as' is the link.
Can you help me to learn more?
(Other definitions for lyric that I've seen before include "Expressing poetical emotions" , "Poem - verse - London theatre" , "having a light quality" , "Airline" , "One barred from native country" .)