Crossword Genius

Imaginary cause of a malfunction (7)

Ross

I believe the answer is:

gremlin

(Other definitions for gremlin that I've seen before include "Mingler (anag.)" , "Mischievous goblin" , "Impish troublemaker" , "Mischievous machine saboteur" , "Mechanical fault" .)

I've seen this clue in The Guardian.
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