Crossword Genius

Centre (6)

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 Telegraph, The Times, The Irish Times, the Evening Standard, The Sunday Times and the Sydney Morning Herald.
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