Cryptic crossword clue
Over-fifties attending Proms upset with traditional German fare 8

The most common and most likely answer to this crossword clue is the 8 letter word ROLLMOPS

I've seen this crossword clue in The Daily Telegraph
R
O
L
L
M
O
P
S

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The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.
This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
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Crossword Answer definitions

ROLLMOPS noun
  1. A fillet of herring, rolled and flavoured with sliced onion and spices then pickled in brine

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