Related Clues:

• Stir on the water?
• Ship's jail
• Sailor's jail
• Penal institution of a sort
• Seagoing slammer
• Sea cell
• Naval assignment?
• Tar's bars?
• Ship's slammer
• Salt container?
• Sailor's slammer
• Navy jail
• Floating jail
• Slammer asea
• Barred enclosure