Possible Clues:

• Foot of a stressed and an unstressed syllable
• Anapest/iamb kin
• Foot of big bird you grabbed
• Long-short foot (metre)
• Namesake of Roman fellow, friend of Pistol
• The long and the short of metrical analysis
• Medicament applied to bottom of the foot
• Long-short foot in poetry
• Foot of enormous bird in the East
• Prosody? That's the long and short of it