Related Clues:

• Word to a captain, perhaps
• Naval answer
• Seafarer's assent
• See 29-Down
• Swabbie's agreement
• Vote in favor
• Seaman's assent
• 'Certainly, captain!'
• Ceiling support
• Building supporter
• Skipper's 'OK'
• Affirmative at sea
• 'Yes, Captain'
• Certain iron girder
• Structural support