If a mans semen is clear does it me he's infertile?

No. You can not determine if a man is infertile by just looking at the semen. To test for male factor infertility you need a full semen analysis where the ejaculate is examined under a microscope by a trained technician who counts the number of sperm and examines their shape and motility.
Semen. No, it does not mean he is infertile. Only examination under microscope will tell the number of sperm and their quality, size, shape, deformities etc.