Related Clues:

• See 20-Across
• 'Aha!'
• 'Ah!'
• Expression of understanding
• 'Eureka!'
• 'Clear as day'
• 'So there!'
• 'I understand!'
• 'Gotcha'
• Word teachers like to hear
• 'So that's what you meant!'
• 'Yes, I see!'
• 'Got you'
• 'There you are!'
• 'Yes!'