Related Clues:

• See 53 Across
• Hourglass flow
• It's under the boardwalk
• Ephemeral castle material
• It's on the beach
• Beach blanket
• Between-your-toes grains
• Prepare for staining
• Smooth in the shop
• Use tweezers
• Make smooth, as wood
• Golf hazard, often
• Take the edge off?
• Lionhearted one's quality
• Shore-castle material