It seems FleMaker Pro supports the export to PDF format, so it should be the natural - and probably also only - choice for CWK to PDF conversion.
Convert ClarisWorks document file to Adobe Portable document format.
We have found 2 software records in our database eligible for .cwk to .pdf file format conversion.
Microsoft Windows software - convert cwk to pdf on Windows
A program used to create and manage information databases
Convert from cwk file format
The tables with software actions are a good pointer for what a certain program does with various file types and often may give users a good hint how to perform certain file conversion, for example the above-mentioned cwk to pdf. However, it is not perfect and sometimes can show results which are not really usable because of how certain programs work with files and the possible conversion is thus actually not possible at all.
Apple macOS / Mac OS X software - convert cwk to pdf on OS X
A database management program for Mac