Related Clues:

• It's not corruption
• Sea bed made lower
• It isn't commonly seen as corruption
• A gorge subject to pollution
• Blemish denied by Londoner
• Corrupt passage
• Corrupt it isn't!
• Lower by degrees into river
• Dirty passage
• Corruption? They say not
• Foul - pass
• Lower - corrupt
• (Trace of) corruption
• Defect — contamination
• Agronomist's sample