Crossword Genius

Seeing posh car from Yorkshire, these people cause controversy (6)

Ross

I believe the answer is:

trolls

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

'these people cause controversy' is the definition.
(as in online trolls)

'seeing posh car from yorkshire' is the wordplay.
I cannot really see how this works, but
'car' could be 'rolls' (short for Rolls Royce) and 'rolls' is found in the answer.
A single letter 't' remains which might be clued in a way I don't understand.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for trolls that I've seen before include "Mythical Scandinavian dwarfs" , "Peer Gynt dwarfs" , "Supernatural dwarfs or giants in Scandinavian myth" , "Scandinavian goblins" , "internet pests" .)

I've seen this clue in The Telegraph.
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