Mischievous tyke (3)
I believe the answer is:
imp
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">mischievous tyke</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 imp that I've seen before include "Naughty demon" , "Mischievous monkey" , "Mischievous child" , "Small mischievous sprite" , "Young troublemaker" .)