Open, genuine (7)
I believe the answer is:
sincere
This clue is a double definition.
'open' is the first definition.
(I've seen this in another clue)
'genuine' is the second definition.
(sincere can mean authentic or genuine)
(Other definitions for sincere that I've seen before include "Candid" , "Showing genuine feelings" , "Lacking in deceit" , "straightforward" , "Unfeigned, genuine" .)