I wouldn't use import_names. If you find it handy then you are probably also not using strict and that is asking for trouble. Really, I think this is a serious, Don't Do That.

Just use a hash to store names, don't put them into a package. Hashes are easy to clear.

But answering your question, should you be doing something so silly, try the following:

*TEST:: = do {local *NEWGLOB};
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But really, I suggest that you don't use that unless you can find from the online documentation (think perldoc) where that information is stored. And there is not a person that I know knows enough to tell you why that code works who would not also agree with my advice to use strict and use hashes. (I am not saying that such people don't exist, but I cannot identify any.)