Related Clues:

• Word of assent
• 'Good going!'
• Cry of delight
• 'Uh-huh'
• Authorize
• 'You bet!'
• 'Yeah, right!'
• Slangy approval
• 'No problem'
• 'I knew it!'
• Hunky-dory
• 'Deal!'
• Allowable
• It's positive
• Up, as a vote