Fault-causing sprite (7)
I believe the answer is:
gremlin
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">fault-causing sprite</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 gremlin that I've seen before include "Fault-causing sprite" , "Troublemaking goblin" , "Mischievous machine saboteur" , "Trouble-making imp" , "Technical bug" .)