I assume your tape player is line in on your soundcard. Yoy use Wavelab lite to record the sound and then trim the necessary wave to the desired length. After this editing is done, you save this file as a wave file (blah.wav).
You then open or create the project in Clean and import the wave file to your project. This wave file should be the edited version you saved in Wavelab Lite.When you highlight this "track" in the Clean interface and choose play, it should play the same as it played within Wavelab....unless you have altered the wave using Clean's parameters.