Related Clues:

• Single-file
• Bicycle type
• Type of bicycle
• (In) single file
• Bike for two
• Type of bike
• Partnership, in a sense
• A couple of people may work in it
• Two-seated bicycle
• Two-wheeler for two
• Bi-bicycle?
• Two-person bike
• Certain two-seater
• (In) association
• Oxen may pull plows in this