Related Clues:

• Add impurities to cement after cut-back
• Soil's crop lifted with quiet instrument
• Pull to unknot the string and muck everything up
• What boomboxes do w/noise
• Belch fumes, say
• Foul pole vault leaving Virginia seething
• Litter, say
• Blow off some steam, maybe?
• Contaminate, foul
• Corrupt vote starts to upset the election
• Pump carbon dioxide into, say