Related Clues:
- Material to prevent leakage
- Repair material
- Door stop, essentially
- Carpenter's space-filling device
- Wedge-shaped leveling piece
- Marine creature circling large water barrier?
- Mason’s wedge
- Perhaps tape large creature next to tiny one
- Slender, gap-filling wedge
- Tapered wooden carpentry piece
- Leveling aid
- Carpenter’s wedge
- Waterproof coat?
- Two creatures together that might stop leaks
- Sugar, maybe, fed to group -- that fills a gap