Crossword Genius

Centre (3)

Ross

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3 4 5

6

(Other definitions for riddle that I've seen before include "Eg, When is a door not a door?" , "Ingenious puzzle - sieve" , "Gradual assimilation of ideas or knowledge" , "Run through" , "Puzzle or strainer" .)

I've seen this clue in The Times, The Telegraph, The Sunday Times, the Sydney Morning Herald, The Irish Times and the Evening Standard.
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