Frank; candid
I believe the answer is:
open
I believe this clue is a double definition.
'frank' is the first definition.
(synonyms)
'candid' is the second definition.
(I know that candid can be written as open)
(Other definitions for open that I've seen before include "hardly high-security" , "yawning" , "begin to > crack" , "This championship includes both professional and amateur golfers" , "Frank and unconcealed" .)