In a sneaky way (5)
I believe the answer is:
slyly
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">in a sneaky way</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for slyly that I've seen before include "In a stealthy and secret way" , "Craftily, cunningly" , "in underhand way" , "In a cunning manner" .)