Related Clues:

• Sprocket
• Clockwork part
• Machine gear
• Part of a gearwheel
• Subordinate person
• Gear feature
• Proverbial minor-yet-important-part
• Gearwheel tooth
• Mechanical wheel
• ___ railway
• Subordinate part
• Gear component
• Metal tooth
• Each of series of teeth on wheel
• A tooth on a wheel