Related Clues:

• Put on one's thinking cap
• Think
• Plan ahead, e.g.
• Lennon classic
• Lennon tune
• Form thoughts
• Think of
• Envisage
• #3 on Rolling Stone's '500 Greatest Songs of All Time'
• Create concepts
• Form notions
• Get creative
• Come up with a plan
• Form a notion
• ''Just think''