Start being candid (4)
I believe the answer is:
open
This clue is a double definition.
'start' is the first definition.
(opening is a kind of starting)
'candid' is the second definition.
(thesaurus)
'being' is the link.
(Other definitions for open that I've seen before include "Undo; ready for business" , "Candid - ready for business" , "Uncovered" , "Not yet decided - to start" , "simple" .)