Crossword Genius

Teaser (6)

Ross

I believe the answer is:

riddle

(Other definitions for riddle that I've seen before include "Eg, When is a door not a door?" , "Word puzzle or coarse sieve" , "The large sieve is a puzzle" , "Sieve; enigma" , "It may have an answer" .)

I've seen this clue in The Guardian.
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