That is how one can move caravan (2,3)

I believe the answer is:

to wit

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'that is' is the definition.
('to wit' can mean 'namely' or 'that is')

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for to wit that I've seen before include "That is to say" , "In other words" , "i.e." , "what to do with a broken-down car!" , "specifically" .)

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