Related Clues:

• 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
• Sailors' hoosegow
• Ship's lockup
• Nautical lock up
• It has bars for tars