Crossword Genius

Puzzling thing (6)

Ross

I believe the answer is:

enigma

'puzzling thing' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for enigma that I've seen before include "WWII cipher" , "Mysteriously puzzling person or thing" , "Riddle - German coding machine" , "Title of Elgar's set of variations" , "Gamine being a bit of a puzzle" .)

I've seen this clue in The Times.
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