Possible Clues:

• That's the one to make a manger
• The sort of manger you'd find on the Continent
• It's enough to make you sick with an inhabitant of Europe
• 'Auf wiedersehen' wisher
• Reginald is up with him on the Continent
• Like sauerkraut and strudel
• Alsatian
• Nationality of citizen of Bonn
• This nationality rang me up
• Composer in danger, manfully opposed