Related Clues:

• Beach home?
• Spiral-shelled mollusk
• Combing find
• Turtle's 'home'
• Triton's trumpet
• Hard outer covering
• Carapace or cartridge
• Carapace or explosive missile
• Shades, perhaps, of what's hard outside
• Shades of having a hard cover
• It's hard to cover the shades with this, perhaps
• How one might get a blow in for Shelley?
• Shades, perhaps, of being hard outside
• Hard to get outside such shades, perhaps
• Perhaps shades of what's in the tank