Clippy's ancient, he must've retired by now :p
It was removed from the default Office 2003 installation and the feature got completely removed in Office 2007. It's available in LibreOffice, but only gets triggered at certain actions, and has been replaced by a light bulb since a few years ago.
To get help in LibreOffice, you just go to the Help menu, and choose LibreOffice Help.
The Help Agent
The Help Agent starts automatically when you are performing a task that might require some assistance.
The Help Agent appears in a small window in a corner of the document. To view the help for the task, click inside the Help Agent window.