Please change name before our wedding (7)
I believe the answer is:
enamour
'our wedding' is the definition.
I can't tell whether this defines the answer.
'please change name before' is the wordplay.
'please' becomes 'our' (I am not sure about this - if you are sure you should believe this answer much more).
'change' indicates an anagram.
'before' means one lot of letters go next to another.
'name' with letters rearranged gives 'enam'.
'our' after 'enam' is 'ENAMOUR'.
(Other definitions for enamour that I've seen before include "Charm, captivate" , "Fill with love" , "entrance" , "Enchant" , "Our name (anag)" .)