Crossword Genius

Fish detected by its odour? (5)


I believe the answer is:


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'fish' is the definition.
(smelt is a kind of fish)

I can't explain the rest of the clue.

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(Other definitions for smelt that I've seen before include "Food fish often fried", "23 [FISH]", "was whiffy", "were high", "Produce metal by heat".)

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