Possible Clues:

• Otto's ''Oh, no!''
• Augsburg 'Oh!'
• Augsburg "Oh!"
• 'Darn!,' in Dortmund
• Berliner's 'Blimey!'
• Berliner's "Blimey!"
• Allentown : 'Alas!' :: Altenburg : '__!'
• German cry of vexation
• Austrian ''Oh, no!''
• Cry of dismay in 5-Across