Unidentified, obscure (7)
I believe the answer is:
unknown
This clue is a double definition.
'unidentified' is the first definition.
(I know that unidentified can be written as unknown)
'obscure' is the second definition.
(I know that obscure can be written as unknown)
(Other definitions for unknown that I've seen before include "Unidentified - not explored" , "Not recognised by anyone" , "Quite obscure - like x" , "Not identified" , "Opposite of 1 Down" .)