Disorder, illness (7)
I believe the answer is:
disease
I believe this is a double definition.
'disorder' is the first definition.
(I know that disorder can be written as disease)
'illness' is the second definition.
(I know that disease is a type of illness)
(Other definitions for disease that I've seen before include "Illness, malady" , "Seaside (anag) -- ailment" , "Ailment, malady" , "scurvy?" , "Bodily disorder" .)