Related Clues:

• 'Gotcha!'
• Finder's cry
• 'I see!'
• 'Now I see!'
• 'I knew it!'
• Exclamation of surprise
• 'Now it's clear!'
• See 20-Across
• 'Aha!'
• Nabber's cry
• 'Understand?'
• 'Eureka!'
• 'So there!'
• 'I understand!'
• 'Gotcha'