Related Clues:

• Shoe part that's wiped on 23-Down
• It's under a foot
• A fish out of school?
• Lone
• Oxford foundation
• Gertrude who swam the English Channel
• Lemon ___
• It's under foot
• Dover delicacy
• Part of a foot
• One-and-only
• Foot feature
• Dover fish
• Flat fish
• 1924 Olympics star Gertrude