Related Clues:

• Sock section
• Bridge piece
• Place for a nail
• Sole support
• Move at a snail's pace
• Saarinen's St. Louis design
• Clipper target
• Pedal digit
• It may be stubbed
• Shoe part that's wiped on 23-Down
• Move bit by bit
• Ballerina's pivot
• It's under a foot
• Keystone site
• A fish out of school?