Pickled herrings (8)
I believe the answer is:
rollmops
'pickled herrings' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for rollmops that I've seen before include "fish food" , "Raw herring fillets" , "fishy concoctions" , "Herrings wrapped around pickles" , "Rolled and pickled herring fillets" .)