The Clarion Report structure does not support HTML as a format. So capturing a field using TinyMCE, and then trying to use that field on a "report" is probably not going to work. You could investigate converting the HTML to say RTF, but I've not had huge success with that.
So I would bypass the "report / pdf" stage, and rather display the document as a complete HTML page, and let the user print it from their browser. (They could print to PDF if they had a PDF printer.)
Cheers
Bruce