Crossword Genius

Not widely understood (6)

Ross

I believe the answer is:

arcane

'not widely understood' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for arcane that I've seen before include "Mysteriouss or secret" , "Ace ran, being mysterious" , "Recondite" , "Abstruse, mysterious" , "Requiring special knowledge" .)

I've seen this clue in The Washington Post.
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