Possible Clues:

• It was meant be sung by Cyril et al in a different order
• Relating to song's words
• Highly enthusiastic, all cry wildly about one
• Enthusiastic jazz singer behind London theatre
• Song-like and poetic
• Show enthusiasm to wax this
• Enthusiastic - expressing the writer's feelings
• We may wax this, using poetic language
• In poetic words, song-like
• Using poetic or song-like language