Crossword Genius

Essential point

Ross

I believe the answer is:

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

This is all the clue.

(Other definitions for crux that I've seen before include "Essential point in the matter or problem" , "puzzle" , "Core" , "Decisive, baffling, point" , "Essence or gist" .)

I've seen this clue in The New York Times.
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