Possible Clues:

• Three-syllable poetic foot
• Three-syllable foot
• Three-syllable foot, in poetry
• Three-syllable limerick foot
• Pattern in prosody
• Three-syllable foot whose last syllable is stressed
• Bit of a limerick
• 'In the Mood,' e.g.
• Articles on nuisance describing (American) foot
• 'Au revoir,' for example