Playful — mischievous (6)
I believe the answer is:
impish
<span class="explanation-format__ClueExplanation">I believe this clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">playful</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(similar in meaning)</span><br/ ><br/ >'<span class="explanation-format__original">mischievous</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I know that mischievous can be written as impish)</span><br/ ><br/ ></span>
(Other definitions for impish that I've seen before include "Mischievous like small fairy" , "Wicked" , "Mischievous like small devil" , "Teasingly mischievous" , "saucy" .)