Crossword Genius

Fish that's been smoked (5)

Ross

I believe the answer is:

roach

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

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for roach that I've seen before include "Silvery freshwater fish" , "Fish - part of a cannabis cigarette" , "Animal found in the water" , "Something fishy here" , "Trim" .)

I've seen this clue in The Guardian.
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