Related Clues:

• 'Aha!'
• Up, as a vote
• Certain
• Secret competitor
• 'Why not?'
• Go-ahead
• 'Undoubtedly'
• Inevitable
• 'Eureka!'
• 'So there!'
• Aye
• Exclamation of affirmation
• 'Gotcha'
• Put to work
• Word teachers like to hear