Are you trying to recognize text selection in other application, then get the text when certain hotkey (like Ctrl + C) is pressed? If that's the goal, then it's not achievable. Clipboard works by the application actively calling Windows API related to the clipboard. It's not based on some magic text selection detection.
If you are not trying to implement this behavior, then you might need to elaborate your goal with more detail.
If you do want to recognize when the selection changes in some other application for summer reason, your best bet is probably using accessibility apis: but good God those apis are terrifying on windows natively. I can't see any accessibility client wrapping crates either (accesskit is for accessibility providers), so going raw windows crate might your best option, but don't expect it to be easy.