Mischievous imp (9)
(Other definitions for gremlin that I've seen before include "Fault-inducing sprite" , "Mischievous elf (in aircraft?)" , "Troublemaking goblin" , "Mischievous machine saboteur" , "Impish troublemaker" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">mischievous imp</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for hobgoblin that I've seen before include "Ugly elf" , "Mischievous sprite - bugbear" , "bogey" , "Evil creature" , "A mischievous or evil spirit" .)