Crossword Genius

Core (4)

Ross

'core' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for crux that I've seen before include "Baffling problem" , "Pivotal point - cross" , "Nub" , "Particular difficulty" , "Essential point in the matter or problem" .)

I've seen this clue in The Guardian and the King Feature Syndicate.
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