Related Clues:

• "If a tree falls in the forest and ..."
• A quarter past twelve and not a soul to be seen
• ... incorporeal fictional 4?
• Ethereal diarist?
• The ghost of Pooter?
• Insignificant person
• Pooter as a diarist
• Ray Charles hit of 1963
• Not a single person at 12 o'clock looked east
• "For __": Beatles' song
• Opposite of a big star
• "I Ain't Got ___" (Louis Armstrong hit)
• Who to tell a secret to, presumably
• #1 Alicia Keys hit of 2007
• Whom to trust, per a 33-Across