Possible Clues:

• Karaoke words
• Largely get tongue around your poem
• Call of bird across one lake, raised in song
• Billy Richardson's part in musical
• Song written for the theatre
• Only rich people can afford the London theatre
• (Words of) song
• A little verse by Cyril
• Verse crazily written out without first and last letters
• How Cyril may have a light sound