Clipboard Manager extension for Gnome-Shell - Adds a clipboard indicator to the top panel, and caches clipboard history.
Extension page on e.g.o: https://extensions.gnome.org/extension/779/clipboard-indicator/
Installation via git is performed by cloning the repo into your local gnome-shell extensions directory (usually ~/.local/share/gnome-shell/extensions/):
$ git clone https://github.com/Tudmotu/gnome-shell-extension-clipboard-indicator.git <extensions-dir>/firstname.lastname@example.org
After cloning the repo, the extension is practically installed yet disabled. In order to enable it, you need to use gnome-tweak-tool - find the extension, titled 'Clipboard Indicator', in the 'Extensions' screen and turn it 'On'. You may need to restart the shell (Alt+F2 and insert 'r' in the prompt) for the extension to be listed there.