Related Clues:

• Response to an order
• Sailor's ''yes''
• Swabby's ''Sure!''
• Navy affirmative
• Marine agreement
• Yes
• ''Si, si'' at sea
• Sailor's OK, and a phonetic hint to this puzzle's theme
• Yeoman's agreement
• Sailor's 'Yes!'
• Yes, at sea
• ''Roger,'' at sea
• Passing comment?
• Sailor's word
• "Sir" preceder, often