Possible Clues:

• Type of ball
• One who takes the inside out of the drain, perhaps
• Perhaps one who gets inside out for rainwater
• Street channel for carrying off rainwater
• Channel close to Viking, say
• Someone removing contents in trough
• Threaten to go out with head of government, say
• Bowler's aversion
• Side of road is good and complete
• Channel with a downspout