Imp causing mechanical faults (7)

I believe the answer is:

gremlin

(Other definitions for gremlin that I've seen before include "Imp causing mechanical problems?" , "Mischievous goblin" , "Mingler that causes damage to machinery" , "Mischievous elf (in aircraft?)" , "Troublemaking goblin" .)

I've seen this clue in the Sydney Morning Herald.

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