Blunt, frank (6)
I believe the answer is:
candid
I believe this is a double definition.
'blunt' is the first definition.
(I know that blunt can be written as candid)
'frank' is the second definition.
(I know that frank can be written as candid)
(Other definitions for candid that I've seen before include "Truthful, frank" , "Frank - and CID (anag)" , "Frank and outspoken" , "Honest and open about what one thinks" , "Truthful and straightforward" .)