Related Clues:

• A common one isn't always so common
• Print, maybe
• Innuendo
• 4-Down, for one
• It may be found with a magnifying glass
• Point of view
• Brainwave
• See 2-Down
• 'I had no ___!'
• Guiding light?
• Fingerprint, perhaps
• Common thing
• Bit of planning
• Have a hunch
• Sleuth's find