Dress up bride with more fussing (9)
I believe the answer is:
embroider
'dress up' is the definition.
(embroider can mean to embellish)
'bride with more fussing' is the wordplay.
'with' means one lot of letters go next to another.
'fussing' is an anagram indicator (fuss can mean to disturb).
'bride' put after 'more' is 'morebride'.
'morebride' with letters rearranged gives 'EMBROIDER'.
(Other definitions for embroider that I've seen before include "Do decorative needlework" , "Ornament with needlework" , "Add (fictitious) detail to" , "Dress up" , "Elaborately sew" .)