Possible Clues:

• Nary a person
• Worst possible turnout (2 words)
• Zero of the population
• "There's ___ here but us . . ."
• "... tree falls in the forest and ___ ..."
• Whom to trust, in spy films
• "There's ___ here but us ..."
• "... said __ ever"
• "If a tree falls in the forest and ___ . . ."
• Herman's Hermits frontman Peter