Related Clues:

• Finding one takes a hail of an effort
• One in line at a station
• It's called on the street
• Airport lurker
• Base neutralizers
• Medallioned vehicle
• Rental car of a sort
• Flagged vehicle
• Big rig compartment
• They turn litmus paper red
• Tourist transport
• Hailed ride
• Fatty __
• Lab flask contents, perhaps
• Etchers' fluids