Crossword Genius

Mysterious (6)

Ross

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'mysterious' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for arcane that I've seen before include "Requiring secret or mysterious knowledge" , "Ace ran, being mysterious" , "deep" , "Secret, hidden" , "Requiring special knowledge" .)

I've seen this clue in The New York Times, the Penny Press, the King Feature Syndicate, the Sydney Morning Herald, the Evening Standard and The Times.
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