Related Clues:

• Light bulb, in the comics
• It may be big
• [Oh ... my ... God!]
• Genesis of a plan
• Think tank matter
• Surprised response
• [Oh, no!]
• ---
• Inventor's brainchild
• Mental creation
• First Greek letter
• "I don't believe it!" noise
• Thought hidden in eight long puzzle answers
• Inventor's first step
• Start of a plan