To run Sed to Screen’s clipboard in Screen’s command-mode

I have a copy in Screen’s clipboard which contains the word Masi aften.
I would like to replace it with Bond effectively such that I edit the clipboard directly in Screen’s command-mode. I know that I could save the clipboard to /tmp and run the replacement there in Vim, but I want to learn Screen.

I run as I have my data in Screen’s clipboard

Ctrl-A : sed s/Masi/Bond/ | [Screen's clipboard]       /// I do not know how to refer to Screen's clipboard by a command other that C-A ]

I get

unknown command sed

How can you run a command to Screen’s clipboard in Screen’s command mode?

To run Sed to Screen’s clipboard in Screen’s command-mode