Crossword Genius

The riddle of the kitchen? (5)

Ross

I believe the answer is:

sieve

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'the riddle' is the definition.
(I've seen this before)

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

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(Other definitions for sieve that I've seen before include "Eratosthenes' invention" , "Craft for Jumblies" , "particle separator" , "Colander" , "Fine riddle" .)

I've seen this clue in The Mirror.
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