When uploading a clean and explicit version of the same song, mark the Explicit track as Explicit:
And list the Clean version without the Explicit tag, specifying that it's a "Radio Edit" on the upload form.
Here's how to specify it's a "Radio Edit" on the upload form:
Under "Song Title" you will see two buttons:
- "+ Add collaborator"
- "+ Version"
Click on the "+ Version" button, and it will open an input box where you can list the version info as Radio Edit.
If you're uploading the clean version of an entire album, format the album title as "Album Title (Radio Edit)"