Ailment, disease (7)
I believe the answer is:
illness
I believe this clue is a double definition.
'ailment' is the first definition.
(I know that illness is a type of ailment)
'disease' is the second definition.
(I know that illness is a type of disease)
(Other definitions for illness that I've seen before include "suffering this" , "Sick condition" , "Ailment, disease" , "Period of sickness" , "Indisposition, sickness" .)