Related Clues:

• Five-speed unit
• Toothed machine part
• What a shift shifts
• Shift selection
• Clockwork part
• Reverse, for one
• Sports equipment
• First, for one
• Landing equipment
• Reverse, drive, or first
• Drive, for one
• Unlike drive, reverse has just one
• Backpack contents
• Clock part, perhaps
• Backpack stuff