Possible Clues:

• Cobblers' output
• Sneaks, say
• Mare's foursome
• Scuffle in the ship over the feet
• Song made famous by Simon and Garfunkel
• They could be running ones
• Campers, e.g.
• Clodhoppers, e.g.
• Slingbacks and slippers
• Spikes, e.g.