There are a couple of ways to copy and paste Clips:
1.Use the ctrl tab on your keyboard:
To copy a Clip, just hit Cmd+C (Mac) or Ctrl+C (PC).
To paste a Clip, just hit Cmd+V (Mac) Ctrl+V (PC)
You can then rename the Clip, if you wish.
2. You can also use the icons in the editor to copy and paste a Clip. You can find these icons above the Stage:
To paste: Click the following icon to paste your Clip (you can find it to the right of the copy icon):
To cut: Click the scissors icon to cut your Clip: