Related Clues:

• Observed absence of small boy?
• Known far and wide
• 'O.K., understood'
• Scribbled down
• Famous number by '50s rocker
• Jotted in margins
• Well-known, like a musical score?
• Composed a letter
• Famous saw
• Recorded piece of music has depth
• Anything but an old-fashioned rocker, it's observed
• Famous collection of books in study turned up
• Celebrious
• Did a ghost's work, maybe
• Celebrated school raised doubts initially