Crossword Genius

Fish detected by its odour? (5)

Ross

I believe the answer is:

smelt

I'm a little stuck... Click here to teach me more about this clue!

'fish' is the definition.
(I know that smelt is a type of fish)

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for smelt that I've seen before include "23 [FISH]" , "whiffed" , "Fish related to the salmon (which ponged?)" , "Stank" , "Food fish often fried" .)

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