Open, frank (6)
I believe the answer is:
candid
<span class="explanation-format__ClueExplanation">I believe this clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">open</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I know that open can be written as candid)</span><br/ ><br/ >'<span class="explanation-format__original">frank</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ ></span>
(Other definitions for candid that I've seen before include "Free and frank" , "Truthful and straightforward" , "Frank - open" , "Frank - and CID (anag)" , "Blunt; frank" .)