Possible Clues:

• Task covered by worker, a loner
• Solitary worker's absorbing task
• Recluse, one who has withdrawn from the world
• Hermit’s tedious task, filling a set of books
• Religious worker holds arduous job
• One who, for religious reasons, has withdrawn from the world
• Solitary worker holds menial job
• Miscreant surrounds house of hermit
• Recluse