Crossword Genius

Flatfish also called a European flounder (5)

Ross

I believe the answer is:

fluke

(Other definitions for fluke that I've seen before include "parasitic worm!" , "Accidental stroke of good luck, or part of whale's tail" , "One lucky" , "Chance happening" , "Accidental success" .)

I've seen this clue in The Mirror.
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