Malaria symptom (4)
I believe the answer is:
ague
'malaria symptom' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for ague that I've seen before include "Fit of the shakes" , "Feverish illness" , "Chills and fever" , "Fever (archaic)" , "Fever with shivers" .)