Related Clues:

• Sudden understanding
• Cry upon figuring out 66-Across
• It's "eureka!" either way
• 'Here's the answer at last!'
• Bingo alternative?
• "I finally get it!"
• Exclamation of knowledge
• 'Now it makes sense!'
• Cry made with a raised index finger
• ''Of course!''
• 'Found you!'
• It may result from a discovery
• 'I see it now!'
• "I have it!"
• ''I understand now!''