Secret, devious (9)
I believe the answer is:
underhand
<span class="explanation-format__ClueExplanation">I believe this is a double definition.<br/ ><br/ >'<span class="explanation-format__original">secret</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(underhand means secret or duplicitous)</span><br/ ><br/ >'<span class="explanation-format__original">devious</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ ></span>
(Other definitions for underhand that I've seen before include "Way of bowling" , "Sneaky" , "way of delivering service." , "Done in sly or secret way" , "Deceitful" .)