Designated fashion centre of Windsor (6)
I believe the answer is:
styled
'designated' is the definition.
(thesaurus)
'fashion centre of windsor' is the wordplay.
'fashion' becomes 'style' ('style' can be a synonym of 'fashion').
'centre of' means to look at the middle letters.
The middle letter of 'windsor' is 'd'.
'style'+'d'='STYLED'
(Other definitions for styled that I've seen before include "Called; (hair) shaped" , "Designed; designated" , "Fashioned" , "Designed, arranged" .)