Possible Clues:

• This one of the nine will have one in stitches
• It takes one of nine to entertain you
• Create a diversion? That's an inspiration
• Divert midstream uselessly
• Divert aggregate about to fill section of hospital
• Sleeper song that will entertain?
• Cause mirth — distract
• Be entertaining and make up several epigrams for starters
• Make 39-Across
• Coax chuckles from