Obvious type of leather (6)
I believe the answer is:
patent
This clue is a double definition.
'obvious' is the first definition.
(similar in meaning)
'type of leather' is the second definition.
(Other definitions for patent that I've seen before include "Licence for inventors; obvious" , "Obvious - protection for inventors" , "It protects an invention" , "It's registered to protect an invention" , "This leather has a glossy varnished surface" .)