The most common and most likely answer to this crossword clue is the 7 letter word TURBOTS
T
U
R
B
O
T
S
Buddy explains!
The straight part
We know that "European fish" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case european fish = turbots.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 TURBOTS mean?
TURBOTS noun- A species of flatfish native to Europe (Scophthalmus maximus, earlier Psetta maxima).
- Any of various other flatfishes of family Scophthalmidae that are found in marine or brackish waters.
- Triggerfish, Canthidermis sufflamen.