Related Clues:

• Promo, perhaps
• It's puzzling
• "When is a door not a door?," e.g.
• ''Cheese'' sayer
• Brief trailer
• Confusing question
• One in a pic
• Challenging puzzle
• Tough riddle
• Product come-on
• Little sample
• It's a mystery
• 'Coming up next' ad
• It doesn't have an obvious answer
• Inscrutable sort