Mysteries of original evil spirit levitating old ladies (7)

I believe the answer is:

enigmas

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'mysteries' is the definition.
('enigma' can be a synonym of 'mystery')

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for enigmas that I've seen before include "'Puzzles, riddles (7)'" , "Problems" , "'Mysteries, riddles (7)'" , "Puzzles - mysteries" , "They're mysterious or difficult to understand" .)

I've seen this clue in the Sydney Morning Herald.

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