Related Clues:

• 'That's it!'
• Cry of success
• 'Finally!'
• 'Mm-hmm!'
• 'I get it'
• Mock words of enlightenment
• Code name
• 'So that's it!'
• 'So that's your game!'
• Walkie-talkie word
• 'Things are becoming clear'
• Comment made with a nod
• 'The light dawns!'
• 'Oh, I see'
• Psychiatrist's reply