Related Clues:
- Penal accommodation required for current generation
- Cage - bird
- Biological unit with a nucleus
- Dungeon
- Room in prison or monastery
- Unit of animal or plant structure
- Animal or plant building unit
- Autograph instrument
- Treaty-signing memento
- One chained to a desk, say
- Part of a prison
- Word on some business cards
- Cooler part
- Clandestine group
- Con's confinement