Vague, obscure (7)
I believe the answer is:
unclear
I believe this clue is a double definition.
'vague' is the first definition.
(similar in meaning)
'obscure' is the second definition.
(unclear can mean obscure or vague)
(Other definitions for unclear that I've seen before include "Not certain" , "Ambiguous" , "Ill-defined or not easily understood" , "in clouds?" , "Vague" .)