Related Clues:

• 'Sure thing, skipper!'
• OK
• 'Let's do it!'
• Encouraging word
• Roll-call vote
• Nope's counterpart
• 'Amen!'
• Agreeable reply
• Yachtie's 'yes'
• Assent
• Salt's 'sí'
• Western agreement?
• Affirmative
• Word often accompanying 54-Across
• Sailor's affirmative