Related Clues:
- Zoo landscaping feature
- Ditch under a drawbridge
- Castle security system
- ''Chicago'' choreographer
- Water under the bridge?
- Castle's protective device
- Defensive trench
- Means of defense, once
- Ring of water
- Medieval protection against invasion
- Wall alternative, perhaps
- Medieval invader's obstacle
- Zoo construction
- 1999 Broadway revue
- Only Best Director Oscar/Tony/Emmy winner in the same year