Possible Clues:

• Bard's feet
• Scanned feet
• Poet's ''da-DA, da-DA''
• Quartet in 'Whose woods these are I think I know'
• Quartet in "Whose woods these are I think I know"
• 'Above' and 'beyond,' e.g
• Two-syllable metric feet
• Feet, as measured in poetry
• Feet initially incised by American surgeon
• Shakespeare's feet