It works in Windows without internet now! This is great for the protected environment I am forced to use - its also a great way for me to not worry about Maven.
A working setup is first needed, though.
So on another machine I load the clojure instarepl up and LightTable automatically puts all the JAR dependencies in a .m2 folder (Maven folder even though I don't even have Maven installed)
I copied the .m2/repositories folder from the machine with LightTable and internet over to the same folder on the 'protected' machine.
I had to completely remove LightTable and reinstall it for things to work after this. Your mileage may vary.
Ultimately, I don't really know how to use Maven and am barely learning Clojure. But at least now I can actually learn it.