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Supernatural force within, transformed now to Sith Lord (3,2,4,5)

Ross

I believe the answer is:

out of this world

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

'supernatural force within transformed' is the definition.
I know nothing about this answer so I can't judge whether it can be defined by this definition.

'to sith lord' is the wordplay.
I cannot quite understand how this works, but
'to' is within the answer.
an anagram of 'sith' is 'this' which is located in the answer.
an anagram of 'lord' is 'orld' which is located in the answer.
This explanation may well be incorrect...

'now' is the link.

Can you help me to learn more?

(Other definitions for out of this world that I've seen before include "Astronauts are sometimes" , "Late" , "brilliant?" , "Delightful" , "worth waiting for" .)

I've seen this clue in The Telegraph.
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