Related Clues:

• Cowboy or Indian, e.g.
• Word from a pro?
• With 51-Across, for the nonce
• Vote in favor
• Seaman's assent
• 'Certainly, captain!'
• Lesson giver
• "___ though I walk . . ."
• Whiz-bang
• Skipper's 'OK'
• Affirmative at sea
• 'Yes, Captain'
• "Aye" dropper?
• Positive feedback
• Former amateur