Crossword Genius

Some unfortunate fish ... (4)

Ross

I believe the answer is:

tuna

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'fish' is the definition.
(tuna is a type of fish)

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for tuna that I've seen before include "Large tasty fish, fond of a nut" , "Type of fish" , "(Meat of) large fish" , "Widely-eaten fish" , "Tunny" .)

I've seen this clue in The Times.
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