Malarial fever (4)
I believe the answer is:
ague
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">malarial fever</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for ague that I've seen before include "Sweating, shivering, fit (once)" , "Malarial fever; chill" , "Malaria, for example" , "Fit of shivering and shaking" , "Feverish illness" .)