Related Clues:

• Cologne contradiction
• Düsseldorf denial
• Nietzsche's negative
• Vienna veto
• German negative sounds like a numeral
• No to the Germans
• 21-Across refusal
• 'Absolut nicht!'
• No, in Essen
• Non, across the Rhine
• Dieter's denial
• Reprimand to a dachshund?
• Cologne turndown
• No, in Berlin
• Denial from Dieter