If you have copied something into your clipboard, just switch to ClipDoubler. The front most window of ClipDoubler is always what is on your Macintosh clipboard. You may switch amongst your clipboards by clicking a window and bringing it to the front. You may also use the Window menu. Clicking the window close box will delete that clipboard.
Option clicking the close box closes all the windows and clears the clipboards.
Notice the button in the upper right corner of the window. Click the mouse or hit a key to close this window. Editing the Clipboard ClipDoubler offers several ways to edit text on the clipboard. Instantly, a new clipboard is created containing only the highlighted text. You can also use ClipDoubler's built in clipboard editor.