Crossword Genius

Essence (4)

Ross

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4

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

This is all the clue.

(Other definitions for crux that I've seen before include "brain-teaser!" , "Most important aspect" , "The most important thing" , "puzzle" , "Point of difficulty" .)

I've seen this clue in The Guardian, the Newsday, the Evening Standard, the King Feature Syndicate, the Penny Press, The Mirror, The New York Times, The Star Tribune, The Wall Street Journal, the Universal and The Telegraph.
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