Rhineland refusal
I believe the answer is:
nein
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">rhineland refusal</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for nein that I've seen before include "German negative sounds like a numeral" , "No to the Germans" .)