Related Clues:

• Famous London weather phenomenon
• Visibility hindrance
• Befuddlement
• Sailing hazard
• Driving danger
• Cause of many an accident
• Put through the blender
• Haze
• London weather, often
• Visibility problem
• Put through the mill?
• Blender speed
• Navigation hindrance
• Naviga-tion hindrance
• Blender option