Related Clues:

• Grand Canyon transport
• Slipper without a back
• Beast of burden
• Part of a wagon train
• Pack animal
• One who won't budge
• Stubborn sort
• Plodding sort
• Plow puller
• Paid smuggler
• Donkey
• Slip-on shoe
• Drug smuggler
• Bedroom slipper
• Stubborn animal