Related Clues:

• Word of assent
• 'Good going!'
• Cry of delight
• 'Uh-huh'
• 'You bet!'
• 'Yeah, right!'
• Slangy approval
• 'No problem'
• 'I knew it!'
• 'Really!'
• It's positive
• Up, as a vote
• Certain
• Secret competitor
• 'Why not?'