Possible Clues:

• 'Nobody sounds so good as she, only one at the end (4)'
• How many Oscars 19-Across won
• Number of points in love
• Nobody - nothing
• Slim to ___ (poor odds)
• "And Then There Were ___" (Agatha Christie book)
• Number of hits in a perfect game
• Canonical hour
• Not one thing
• Questionnaire box, perhaps