Related Clues:

• Parapet built by fellow in transport business
• Railing at first against line taken in transport business
• Support at hand for those on flight
• Railing and repartee is accepted
• Sounds like the record-breaking athlete is going up the stairs?
• A security device for the flight
• A guard is taking part in the repartee
• It's reassuring if you feel shaky on the flight
• Rail one's found in chaff
• Pillars bear special, one-off bit of railing?
• Is jesting about providing support on flight
• Stair-rail
• Coping with supporters a bad result upset?
• Labour upset American business support
• Supporter is engaging in jokey comments