Herring fillet rolled around onion slices and pickled in spiced vinegar (7)

I believe the answer is:

rollmop

(Other definitions for rollmop that I've seen before include "Pickled fillet of raw herring" , "Food" , "Pickled herring wrapped around onion slices" , "Dish of herring fillet" , "savoury dish" .)

I've seen this clue in The Mirror.

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