Obscure, uncertain (7)
I believe the answer is:
unclear
This clue is a double definition.
'obscure' is the first definition.
(unclear can mean obscure or vague)
'uncertain' is the second definition.
(thesaurus)
(Other definitions for unclear that I've seen before include "in clouds?" , "Ill-defined or not easily understood" , "Vague" , "hard to understand" , "Not distinct in nuclear way" .)