Crossword Genius

Something puzzling (6)

Ross

I believe the answer is:

enigma

'something puzzling' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for enigma that I've seen before include "Mysterious puzzle" , "Puzzle for gaming" , "cryptic puzzle!" , "closed book" , "Difficult problem" .)

I've seen this clue in the USA Today.
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