Crossword Genius

Fish emitted unpleasant odour (5)

Ross

I believe the answer is:

smelt

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'fish' is the definition.
(I know that smelt 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 smelt that I've seen before include "Food fish often fried" , "were high" , "Stank" , "humming" , "Small silvery fish" .)

I've seen this clue in The Times.
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