Rubella (6,7)
I believe the answer is:
german measles
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">rubella</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I know that rubella can be written as German measles)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for german measles that I've seen before include "Rubella" , "viral illness" , "complaint" .)