Related Clues:

• The dog that didn't bark, perhaps
• It has nine rooms
• Crossworder's need
• Detective's delight
• Set with no level of intelligence, like this?
• Staple of Agatha Christie mysteries
• Hint for Sherlock
• Puzzle feature
• Intimation (like this?)
• What you're reading is signal to bear left
• Muddy footprint, sometimes
• For example, this board game's no party
• Meat for someone else? Nothing eaten by good boy
• Is this a help to see the light?
• Dangerous substance Petty Officer is taking regularly