Crossword Genius

Brain-teaser and coarse sieve (6)

Ross

I believe the answer is:

riddle

'brain-teaser and coarse sieve' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for riddle that I've seen before include "The large sieve is a puzzle" , "unsolved problem" , "Cryptic statement" , "Make many openings" , "Sieve or conundrum" .)

I've seen this clue in The Irish Times.
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