Related Clues:

• Travel channel?
• Rural road feature
• Repetitive pattern
• Carriage track
• Track impediment
• This can be monotonous
• Tiresome routine
• Wagon wheel groove
• It's hard to get out of
• Deep groove
• Monotonous practice
• Tiresome grind
• Concavity
• Long groove
• Endless 9-to-5 job, e.g.