Crafty, underhand (6)
I believe the answer is:
sneaky
<span class="explanation-format__ClueExplanation">This clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">crafty</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ >'<span class="explanation-format__original">underhand</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I know that underhand can be written as sneaky)</span><br/ ><br/ ></span>
(Other definitions for sneaky that I've seen before include "Deceitful, underhand" , "Furtive or given to telling tales" , "Secretive and sly" , "Furtive, underhand" , "Sly and devious" .)