Evil dwarfs (6)

I believe the answer is:

trolls

(Other definitions for trolls that I've seen before include "They start rows on the internet" , "Scandinavian goblins" , "Supernatural dwarfs or giants in Scandinavian myth" , "Mythic Scandinavian creatures" , "cave-dwellers" .)

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

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