Related Clues:

• Groundbreaking construction tool?
• River cleaner
• Dig (up), as information
• Leveler
• Clean the waterway
• 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
• Remove material from a channel or riverbed