Related Clues:

• A two-masted boat and an abbreviation of an army rank
• Right to enter large ship
• Seagoing cooler?
• Clink on the drink
• Barrier of stakes and timbers
• Sailing vessel of some size straddling river
• Standard help, we hear, for barrier
• Jail, informally
• Jib rigged around ship
• Standard saddle regularly found in old fort
• British soldier back in prison
• Fort lockup
• Two-masted square-rigged sailing ship
• Prison at sea
• Ship; prison