Relation is given article that's soiled (7)
I believe the answer is:
unclean
'soiled' is the definition.
(I've seen this before)
'relation is given article' is the wordplay.
'relation' becomes 'uncle' (uncle is a kind of relation**).
'is given' is a charade indicator (letters next to each other).
'article' becomes 'an' (indefinite article).
'uncle'+'an'='UNCLEAN'
'that's' is the link.
(Other definitions for unclean that I've seen before include "Filthy" , "Dirty or unwashed" , "Spotted" , "Polluted" , "Infected" .)