Related Clues:
- Medieval fortification
- Battering-ram countermeasure
- Drawbridge necessitator
- Ditch openings of foreign operas; Schwarzkopf sings English
- A defensive all-rounder
- It should contain enough water to go round
- Water crossed via a drawbridge
- Water-filled ditch around stronghold
- Trench around castle
- Trench around building
- Water round a castle
- Zoo's fence alternative
- Castle obstacle
- Castle-circling ditch
- Protective zoo feature