Related Clues:

• In high --
• Clock part, perhaps
• Backpack stuff
• Bat, ball, glove, etc.
• Reverse or drive
• Neutral, e.g.
• Drive or second
• Backpack fill
• Transmission setting
• Skis, boots, masks, etc.
• Proverbial minor-yet-important-part
• Car-transmission selection
• Gearwheel tooth
• Parapher-nalia
• Accouterments