Possible Clues:

• 'Well, that's that!'
• Last page phrase
• With 39-Across, doomsayer's assertion ... or a phonetic hint to 18-, 24-, 51- and 61-Across
• Bedtime story's final words
• Final film caption
• ''Case closed''
• He'd ten unusual words to finish a book
• Half-time backing from English part of the ground when it's all over
• Credits preceder, often
• Final words on screen nurse gets about man