Related Clues:

• Copacetic
• Free from care
• 'Not a problem'
• 'I'm game'
• Hassle-free
• Fine, to NASA
• Running perfectly
• Indisputable
• "No sweat!"
• ''Absolutely!''
• NASA 'thumbs up'
• A breeze
• 'Be careful!'
• Not forced
• 'Slow down!'