Related Clues:

• Pollute, make dirty
• Make dirty in a gorge?
• A gorge subject to pollution
• Corrupt passage
• Dirty passage
• Foul - pass
• Narrow pass; pollute
• Create pollution in a gorge
• Spoil; steep-sided gorge
• Soil found in gorge
• Mar; narrow gorge
• Foul pass
• Sully; narrow gorge
• Pass giving foul
• Pass with dishonour?