Related Clues:

• Step outside steamship with awfully green travellers
• Fares going up on flights?
• Plays nice
• Weak team members who'll get transferred by coach, perhaps
• Travellers on a bus, etc
• Goes around North with German travellers
• Is compatible
• People on buses perhaps see prangs developing and start to shout
• Nasty gasp and sneers -- they're taken for a ride
• Retired head plugging bleepers for travellers?