Ingenious astigmatism and verticals centrally give character to Mona Lisa's smile? (9)
I believe the answer is:
enigmatic
'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.
Can you help me to learn more?
(Other definitions for enigmatic that I've seen before include "Obscure, puzzling" , "not obvious" , "Difficult to interpret" , "Ambiguous or puzzling" , "Puzzling, like the Sphinx" .)