Related Clues:

• Toothed bar
• Toothed machine part
• Tooth that won't bite
• Clockwork part
• Machine gear
• Part of a gearwheel
• Subordinate person
• Gear feature
• Garage tool
• Escalate, with ''up''
• Proverbial minor-yet-important-part
• Gearwheel tooth
• Mechanical wheel
• Increase gradually, with ''up''
• ___ railway