
Welcome to InkscapeForum!
When you used the Selection tool to select something, before setting the clip, what did you select? You need to select both the clipping path (the last duplicate) and the blurred object. And as you've learned, with the clipping path on top of the blurred object. You can hold the Shift key to make a multiple selection.
No, there's no better way -- clipping is absolutely the best way to get rid of blur bleed. It just takes a bit of practice sometimes. I'm not clear whether you may have selected only one object or more than 2. If all you have there is the blurred object and the clipping path (the duplicate), then dragging the selection box is a great way to do it. But you mentioned making copies. So if you have more than 2 objects all stacked up, it would probably be better to use the Shift key to make a multiple selection. And possibly you might use the Alt key as well. The Alt key allows you to select objects which are hidden below other objects. So here might be one way to select the 2 proper objects.
-- click once on the top object (the clipping path)
-- without moving the mouse, hold Alt + Shift then click once more
Also note that you can look at the status bar when you select things, to make sure you're selecting what you mean to select. There you can see the style info on the left and some text descriptions in the middle.
You can also clip a group of objects. So another option would be to group all the stacked up objects, excluding the clipping path. Then select the group and the clipping path. And my last thought is that you might not have actually selected the blurred object. If there is a really lot of blur, sometimes you have to drag the selection box much bigger, to make sure you get it selected.
After you get the hang of it, you'll find a few different techniques that work in different situations. For example, let's say you're doing this with just a simple circle. You might make the clipping path with a stroke and no fill. Then it's easy to select it, and the circle below it, just by holding the Shift key. I don't often use that, because if you ever have to release the clip, it might be hard to see the original clipping path since it's just a stroke. I usually make my clipping paths with some outrageous color (hot pink, neon green, etc.) to keep from confusing them with the objects I'm clipping, if I ever have to release the clip.
Anyway, sorry to be rambling on

Let us know how it goes
