Related Clues:

• Not hard, to conceal a plan
• It might begin with a 'What if ...?'
• Fancy a fish first?
• One almost expired producing brainwave
• Inventor's asset
• Cartoon lightbulb
• It may be thrown out at a meeting
• Birth of an invention
• 'Paris is always a good ___' (line from the film 'Sabrina')
• Stealing the Declaration of Independence is an example of a terrible one
• Incandescent light bulb depiction (because I have yet to see a CFL bulb depict one)
• Word after big or bright
• It's formed in one's head
• Notion viewed in wide angle
• Lightbulb, figuratively