Puzzling, mysterious (9)
I believe the answer is:
enigmatic
I believe this is a double definition.
'puzzling' is the first definition.
(I know that puzzling can be written as enigmatic)
'mysterious' is the second definition.
(I've seen this before)
(Other definitions for enigmatic that I've seen before include "Difficult to interpret" , "Puzzling, like the Sphinx" , "Like a puzzle" , "Mystifying" , "with a mystery ingredient" .)