Crossword Genius

Ingenious astigmatism and verticals centrally give character to Mona Lisa's smile? (9)

Ross

I believe the answer is:

enigmatic

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'ingenious' is the definition.
Both the answer and definition are adjectives. Maybe there's a link between them I don't understand?

I don't understand how the rest of the clue works.

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(Other definitions for enigmatic that I've seen before include "Obscure, puzzling" , "not obvious" , "Difficult to interpret" , "Ambiguous or puzzling" , "Puzzling, like the Sphinx" .)

I've seen this clue in The Times.
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