Related Clues:

• Humdrum habit
• It's regrettable for a routine or a road
• Rugby match in the centre creates furrow
• Relentless grind
• Bored worker's routine
• Tiresome practice
• Furrow in a track
• What pepper mills do
• Dirt road furrow
• Routine that's hard to get out of
• Predictable pattern in regular letters from Proust
• Tire groove
• 'Same old' place to be stuck
• Boring routine, metaphorically
• Dull groove