Trim

The User Interface > Preview/Edit Window > Text/Edit Tab > Editor Toolbar... > Trim

Removes leading spaces and control characters such as linebreaks and tabs.

This works on the whole clip, or a selection, and is not a "line by line" process. It's meant to be a quick way to get rid of the "extra junk" that gets copied from many programs.

Aside from the editor toolbar, it can also be found on the Classic and ClipBar toolbars.