Related Clues:

• Earth-moving machine
• Cover in flour
• River cleaner
• Dig (up), as information
• Clean the waterway
• Searches the river
• Flour-coat
• Channel maintenance machine
• Sprinkle in flour
• Mud-sucking machine
• Clean out from river bottom or harbour
• Remove earth from under water
• Scoop mud from, say, harbour
• Scoop up mud and silt from harbour bottom
• Clean out the bed of a river or harbour