Little devil (3)
I believe the answer is:
imp
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">little devil</span>' is the definition.<br/ ><span class="explanation-format__explanation">(an imp is a little demon)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for imp that I've seen before include "Emperor" , "Small devil or sprite" , "pickle" , "Young troublemaker" , "old-fashioned graft" .)