The most common and most likely answer to this crossword clue is the 4 letter word SCUP
I've seen this crossword clue in The Times
S
C
U
P
More clues leading to the result SCUP
Buddy explains!
The straight part
We know that "fish" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case fish = scup.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 SCUP mean?
SCUP noun- A common sparoid food fish, Stenotomus chrysops, of temperate regions of the Atlantic coast of North America; the porgy.
- A swing.