Related Clues:

• Top edge
• Toll unit, sometimes
• Boston nickname
• Salt setting in a margarita
• Turnpike toll unit
• Wheel turner
• Weigh station unit
• Car rod
• Boston, with 'The'
• Air balls miss it
• Airline home base
• O'Hare, e.g.
• Activity center
• Bicycle part
• Tire rotator