Related Clues:

• "Macbeth" witches' word
• Spartacus was one
• Belabor
• Virus variety
• Try hard
• Go too far with
• Sweat producer
• Break one's back, but not really
• Captive worker
• Ben-Hur, for a time
• Wearisome work
• Lay on thick
• Arduous activity
• ___ and trouble
• Harriet Tubman "passenger"