Related Clues:

• Spartacus was one
• Sweat producer
• Break one's back, but not really
• Captive worker
• Ben-Hur, for a time
• Wearisome work
• Arduous activity
• ___ and trouble
• Harriet Tubman "passenger"
• Do scut work, e.g.
• Put in long hours
• ''... ___ and trouble'' (''Macbeth'')
• It's not light work
• Work your fingers to the bone
• Work with scant appreciation