Unfashionable clothes seen in suburbia (9)
I believe the answer is:
outskirts
'suburbia' is the definition.
(thesaurus)
'unfashionable clothes' is the wordplay.
'unfashionable' becomes 'out' ('out' can be a synonym of 'unfashionable').
'clothes' becomes 'skirts' (**).
'out'+'skirts'='OUTSKIRTS'
'seen in' is the link.
(Other definitions for outskirts that I've seen before include "borders" , "surrounding area" , "area away from town centre" , "Edges (of town)" , "Outer regions (of town)" .)