Clear, obvious (6)
I believe the answer is:
patent
I believe this is a double definition.
'clear' is the first definition.
(synonyms)
'obvious' is the second definition.
(similar in meaning)
(Other definitions for patent that I've seen before include "licence inside" , "glaring" , "Open the right to an invention" , "This leather has a glossy varnished surface" , "Registration of an invention or trade name" .)