Puzzling (9)
'puzzling' is the definition.
(I know that puzzling can be written as enigmatic)
This is all the clue.
(Other definitions for enigmatic that I've seen before include "Obscure, puzzling" , "Puzzling, like the Sphinx" , "Mystifying" , "Mysterious or puzzling, like Mona Lisa's smile" , "Difficult to interpret" .)
(Other definitions for confusing that I've seen before include "Perplexing, puzzling" , "Bewildering or perplexing" , "Muddling" .)