Related Clues:

• Knowing comment
• 'Noted'
• 'So THAT's what's going on here!'
• Caught word of
• Response to 'Got it?'
• 'That's interesting'
• 'That clears it up'
• 'It's clear now!'
• One spy that is now clear
• "Makes sense now!"
• ''That makes sense now''
• Phrase of realization
• ''OK, got it''
• ''So that's how''
• Picked up aurally