Related Clues:

• Reason for an "R"
• Reason for an "R" rating, perhaps
• Horror movie attraction
• It's messy
• Former veep
• Slasher-movie offering
• See 38-Down
• London forecast
• State of confusion
• Excessive bloodshed
• Name on a butterfly ballot
• Weather London is famous for
• Blood and guts
• Pea soup
• Murk