Crossword Genius

Vital point (4)

Ross

I believe the answer is:

crux

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

This is the entire clue.

(Other definitions for crux that I've seen before include "Decisive point of an issue" , "Key point" , "Essential point in the matter or problem" , "Point of difficulty" , "brain-teaser!" .)

I've seen this clue in The Independent.
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