Crossword Genius

Somewhat mischievous fairy (7)

Ross

I believe the answer is:

gremlin

(Other definitions for gremlin that I've seen before include "Mischievous elf (in aircraft?)" , "Cause of mechanical failure?" , "Troublemaker (in the machinery?)" , "Mingler (anag.)" , "Fault-inducing sprite" .)

I've seen this clue in The Guardian.
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