Illness, malady (8)
I believe the answer is:
sickness
I believe this is a double definition.
'illness' is the first definition.
(I know that illness can be written as sickness)
'malady' is the second definition.
(I know that malady can be written as sickness)
(Other definitions for sickness that I've seen before include "Infirmity" , "It's not looking good" , "Illness, malady" , "Ill health" , "State of ill-health, malady" .)