Cryptic crossword clue
Swears violently catching second fish 7

The most common and most likely answer to this crossword clue is the 7 letter word WRASSES

I've seen this crossword clue in The Daily Telegraph
W
R
A
S
S
E
S

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 = wrasses.
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 WRASSES mean?

WRASSES noun
  1. Any one of numerous edible, marine, spiny-finned fishes of the family Labridae, of which several species are found in the Mediterranean and on the Atlantic coast of Europe. Many of the species are brightly colored.

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