Cryptic crossword clue
Fish in passage you and I must catch 7

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

I've seen this crossword clue in The Guardian
W
A
L
L
E
Y
E

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 = walleye.
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 WALLEYE mean?

WALLEYE noun
  1. (plural "walleyes") One or a pair of sideways-looking misaligned eyes.
  2. (plural "walleyes") An unusually pale eye.
  3. (plural "walleye" or "walleyes") A species of gamefish, Sander vitreus, native to the Northern U.S. and Canada with pale, reflective eyes.

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