The most common and most likely answer to this crossword clue is the 11 letter word SILVERSIDES
I've seen this crossword clue in The Times
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More clues leading to the result SILVERSIDES
Buddy explains!

The straight part
We know that "Cuts /fish" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case cuts /fish = silversides.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.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does SILVERSIDES mean?
SILVERSIDES noun- Any of several small fish, mostly in families Atherinidae and Atherinopsidae, both in order Atheriniformes, that are characterized by bright, silvery scales.
- The upper side of a round of beef.
- Corned beef made with this type of meat.
- A silverside (fish in order Atheriniformes).