Possible Clues:

• Poetic pattern
• ABBA, for instance
• AABB or ABAB, e.g
• ABAB in a poem, e.g
• Pattern at ends of lines of verses
• Maybe ABBA anthem cut short amid wild cheers by yours truly
• Pattern of verse line endings
• AABBA, in limericks
• AABBA, for a limerick
• Pattern governing a poem's structure