Crossword Genius

Mysterious puzzle (6)

Ross

I believe the answer is:

enigma

'mysterious puzzle' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for enigma that I've seen before include "Difficult problem" , "Elgar Variations nickname" , "WW2 code" , "Gamine being a bit of a puzzle" , "Puzzle for gaming" .)

I've seen this clue in The Times.
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