Related Clues:
- Groove made by wheel
- Crush into particles
- Fixed (and tedious?) course
- Furrow caused by wheels
- Pulverise
- Make oatmeal from oats
- Prepare, as coffee beans
- Have a bit of a smirk at German for such drudgery
- Custer leaves structure in ditch
- Groove in a road
- Biker's hazard
- Nine-to-five drudgery, say
- Groovy track?
- Symbol of tiredness
- Work hard and persistently