Crossword Genius

Essential point (4)

Ross

I believe the answer is:

crux

'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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