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 pith that I've seen before include "Spongy tissue like that lining an orange skin" , "White tissue under the rind of citrus fruit" , "Spongy tissue lining rinds of oranges, or the essential part" , "Soft tissue; essence" , "Citrus rind lining" .)

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