Related Clues:

• Mississippi floater
• Inside of a paper towel roll
• Oil paint purchase
• Whitewater transport
• Underground plant part
• Bazooka, essentially
• Potato or yam, e.g.
• Taro or potato
• Makeshift barge
• London subway, with "the"
• Potato or yam
• Balsa boat
• River vessel
• Sunblock container
• Castaway's transport