Increase in general disorder (7)
I believe the answer is:
enlarge
'increase' is the definition.
(enlarging is a kind of increasing)
'general disorder' is the wordplay.
'disorder' indicates anagramming the letters (I've seen 'diseased' mean this (I've seen this in other clues)).
'general' is an anagram of 'ENLARGE'.
'in' acts as a link.
(Other definitions for enlarge that I've seen before include "Lengthen" , "Make big" , "Dilate" , "Make bigger in general" , "Make greater" .)