Elegant fashion on a bride (8)
I believe the answer is:
debonair
'elegant' is the definition.
(thesaurus)
'fashion on a bride' is the wordplay.
'fashion' is an anagram indicator.
'on'+'a'+'bride'='onabride'
'onabride' with letters rearranged gives 'DEBONAIR'.
(Other definitions for debonair that I've seen before include "Cheerful, charming and elegant" , "The dashing" , "Bride on a swing has carefree, urbane manner" , "I broaden out, being self-confident and carefree" , "Having a carefree confident manner" .)