Crossword Genius

Mystery (6)

Ross

There are a few possibilities for this:

'mystery' is the definition.
(thesaurus)

This is all the clue.

(Other definitions for puzzle that I've seen before include "Crossword maybe" , "Ingenious problem" , "A game to test ingenuity" , "See 10" , "See 1" .)

I've seen this clue in The Telegraph, The Times, the LA Times, the Evening Standard, the Penny Press, The Mirror, the King Feature Syndicate, the USA Today, The Guardian, The Independent, The Star Tribune and the Universal.
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