Crossword Genius

Heart of the matter (4)

Ross

There are a few possibilities for this:

'heart of the matter' 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 "The most important thing" , "Core" , "Most important aspect" , "Particular difficulty" , "Pivotal point - cross" .)

I've seen this clue in the LA Times, The Guardian, the Universal, the King Feature Syndicate and The New York Times.
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