Possible Clues:

• Blunder in excursion to summit?
• Cause another runner to fall when journey has finished
• How one might fall for a voyage in space
• Catch out or cause to stumble
• Is Pirt the way to bring about the Fall?
• Catch out after blunder in court
• Fall over getting gash in upside-down place
• Make a mistake with unfortunate footfall perhaps
• Catch in a contradiction
• Go wrong in journey to the north?