Feverish chill (4)
I believe the answer is:
ague
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">feverish chill</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 ague that I've seen before include "Illness with fever and shivering, malaria say" , "Chills and fever" , "Fit of the shakes" , "Feverish chill" , "Fit of shivering and shaking" .)