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 all the 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 Guardian, the LA Times, the King Feature Syndicate, The New York Times and the Universal.
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