Related Clues:

• Defense that may be all wet
• Watery fortification
• Safety feature for zoo visitors
• Home to a zoo crocodile, perhaps
• Onetime Tower of London surrounder
• Barrier to entry?
• Bob with eight Tonys for choreography
• Noted "Cabaret" choreographer
• Castle's water protection
• Water with no endpoint
• The limits to molecular heat around the castle
• "Chicago" director Bob
• Castle or zoo barrier
• Broadway choreographer for 'Chicago'
• Defence bird once needed, ending in court