Edit, Onload workflow to Clear Field

Edit, Onload workflow to Clear Field

Hello, 

I'm trying to figure out how to add this to a work flow. I want to be able to clear a multi line field on load of the record when it is edited. I want to require this so that the user has to input new details/comments on why the record is being edited. Is there any way to have an "on Load" of a module that it will clear a field? 

Thanks!