Related Clues:

• Jolly fellow?
• Perfectly correct
• 'No argument here'
• Beyond doubt
• ''Message received''
• Received, at NASA
• Able to be proven
• Radioer's 'Got it!'
• ''You're right''
• Kind of blue?
• Dead on target
• 'Can't argue with that'
• 'No question'
• '___ dat!'
• Opposite of 68-Across