Related Clues:

• Enthusiastic response
• 'Ah!'
• Expression of understanding
• 'Clear as day'
• 'Gotcha'
• 'You said it!'
• 'Got you'
• 'Indeed!'
• 'You betcha!'
• 'Mm-hmm!'
• 'So that's it!'
• 'Things are becoming clear'
• Comment made with a nod
• '___, right!'
• Part of a Beatles refrain