Crossword Genius

Heart (4)

Ross

There are a few possibilities for this:

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3

4

5 6 4* 6*

'heart' 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 "Most important aspect" , "Vital part of a matter, decisive point" , "Essential point of problem, decision etc" , "Essence or gist" , "Nub" .)

I've seen this clue in The Mirror, the King Feature Syndicate, The Wall Street Journal, the Evening Standard, The New York Times, the Canadiana, the Penny Press, The Telegraph and the LA Times.
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