Related Clues:

• Master's minion
• "Double, double --- and trouble..."
• Travail
• Work like Tillie?
• Proceed laboriously
• Unpaid worker
• Hard labor
• Do drudgery
• Toil
• Kind of wages
• Spartacus, for one
• Put one's nose to the grindstone
• Turbulence
• Underground Railroad user
• ''Amistad'' extra