Undress bride, so excited (7)
I believe the answer is:
disrobe
'undress' is the definition.
('disrobe' can be a synonym of 'undress')
'bride so excited' is the wordplay.
'excited' indicates an anagram.
'bride'+'so'='brideso'
'brideso' is an anagram of 'DISROBE'.
(Other definitions for disrobe that I've seen before include "bare" , "Strip" , "Get undressed" , "Remove formal clothing" , "Undress" .)