Pickled herrings (8)
I believe the answer is:
rollmops
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">pickled herrings</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(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" .)