Surreptitious, underhand (7)
I believe the answer is:
furtive
<span class="explanation-format__ClueExplanation">I believe this is a double definition.<br/ ><br/ >'<span class="explanation-format__original">surreptitious</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >'<span class="explanation-format__original">underhand</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ ></span>
(Other definitions for furtive that I've seen before include "Sly and secretive" , "Skulking" , "Sly, underhand" , "Clandestine" , "Sneaky" .)