Slight is due to corruption (7)
I believe the answer is:
outside
'slight' is the definition.
(thesaurus)
'is due to corruption' is the wordplay.
'corruption' indicates an anagram.
'is'+'due'+'to'='isdueto'
'isdueto' is an anagram of 'OUTSIDE'.
(Other definitions for outside that I've seen before include "Not indoors" , "In the fresh air?" , "Where smokers now often must go" , "Alfresco" , "External surface" .)