Related Clues:

• Bit more to make this usually triumphant
• They did theme to "The Living Daylights"
• Code cracker's cry
• What a teacher likes to hear from a pupil
• Exclamation akin to 17-Down
• "Surprise!"
• Cry of satisfaction
• "I see what you're up to!"
• ''Thought so!''
• Cry when a light goes on
• 'The penny drops!'
• Word of discovery
• 'I'm onto your scheme!'
• I've got it!
• Sudden understanding