Related Clues:
- Turtle's 'home'
- Blade cover
- Holder for a dagger
- Hard outer covering
- Carapace or cartridge
- Protective case for a knife or sword
- Cover for a sword
- Carapace or explosive missile
- Casing for a sword
- Case for a dagger
- Protective covering for a knife
- Case for a sword
- Shades, perhaps, of what's hard outside
- Shades of having a hard cover
- It's hard to cover the shades with this, perhaps