The most common and most likely answer to this crossword clue is the 7 letter word AXOLOTL
I've seen this crossword clue in The Guardian
A
X
O
L
O
T
L
More clues leading to the result AXOLOTL
- Too lax at sea to catch large amphibian
- Amphibian awfully lax catching nothing by chance
- Many loath at first to grab cross old salamander
- Too lax at sea to keep line for aquatic creature
- Walking fish lax about accepting love and fate
- Mexican native frequently left broken by Beast from the East
- Mexican inhabitant orders unopened ballot box
- Salamander scattering a couple of eggs in Manx flat ale regularly
- Mexican lake-dweller too lax to swim on lake
Buddy explains!
The straight part
We know that "Walking fish" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case walking fish = axolotl.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 AXOLOTL mean?
AXOLOTL noun- A critically endangered salamander found in the elevated lakes of Mexico, Ambystoma mexicanum.