Cautious, circumspect (8)
I believe the answer is:
discreet
<span class="explanation-format__ClueExplanation">I believe this is a double definition.<br/ ><br/ >'<span class="explanation-format__original">cautious</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ >'<span class="explanation-format__original">circumspect</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I know that circumspect can be written as discreet)</span><br/ ><br/ ></span>
(Other definitions for discreet that I've seen before include "Careful not to attract attention" , "Diplomatic" , "Cautious, not giving away secrets" , "Showing prudence and circumspection" , "Unobtrusive, circumspect" .)