Obscure or 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 "An ulcer (anag)" , "Indistinct" , "Doubtful" , "in clouds?" , "hard to understand" .)