Related Clues:
- Device that allows movement in one direction only
- Tooth in a machine
- Hardly a big wheel
- Tooth on the rim of gear wheel
- Tooth on the edge of wheel
- Damaged the cart's wheel? Maybe
- Increase incrementally, with 'up'
- Red mullet's tail taken by rodent that has teeth
- A toolmaker may produce one, setting one's teeth on edge
- Key underling
- Device preventing turning backwards
- Wheel in turnstiles
- Minor player in Umberto Eco ghost story
- Bar that fits into the notches of a toothed wheel
- Company takes on good employee who'll play small part