Related Clues:

• 'Aha!'
• 'Understand?'
• 'I understand!'
• Cry of success
• Understood
• 'Oh, I see'
• Trucker's approval
• Catch phrase?
• 'I see'
• 'Understood'
• 'Now I understand!'
• 'I understand'
• 'Mine!'
• "Understood!"
• Aha!