Related Clues:

• Jay Leno role
• Jon Stewart, for one
• A party to a party?
• ''Miss America'' host
• Head roaster
• Party leader, maybe
• Ringmaster
• Master of ceremonies
• Party leader?
• Party giver
• Leno, notably
• 'And now ...' sayer
• Act opener
• Mike holder, at times
• One appearing between numbers