Possible Clues:

• Charlie perhaps was the kind of mate to indicate
• 20's reason fool follows regular pattern
• Sounds like something sub-editor would do for those drinking and driving?
• What made chicken opt for a secure road crossing
• Report of European corporation gathering in place at international border?
• Charlie's one part of frontier?
• Manned border crossing
• Charlie in Berlin, for instance
• European broadcast on aim for border crossing
• Examination site where those with correct papers may pass