Crossword Genius

Someone being virtually insulting? (5)

Ross

I believe the answer is:

troll

I'm a little stuck... Click here to teach me more about this clue!

'someone' is the definition.
The definition and answer can be both people as well as being singular nouns.
Maybe you can see an association between them that I can't see?

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for troll that I've seen before include "Fish by drawing bait along in the water" , "Dwarfish creature" , "Fish with a moving bait" , "Fish by pulling a hook, line and sinker" , "Malignant elf" .)

I've seen this clue in The Telegraph.
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