Silver darling? Maybe bride expected this to be gold (7)
I believe the answer is:
herring
'silver darling?' is the definition.
(Scottish name for herring)
I don't understand how the rest of the clue works.
(Other definitions for herring that I've seen before include "Fish of northern waters, can be salted or pickled" , "Sea fish" , "Important food fish" , "one could be soused" , "It's certainly fishy!" .)