What sort of clay? Pottery clay? If that is what you are talking about, there is a "glue" you get at the pottery supply store or ceramics store called Patch-attach (or something very similar). It can be used to "glue" raw pottery or ceramics (greenware) or bisque pieces. It is quite satisfactory. No actual glue will work on pieces that go into the kiln, as all will burn off in the high temps.
If you are not refiring pieces, and you are talking about pieces that have been fired once (bisque) than any glue that is made for china will work. Most epoxy glues are fine, or hot glue will work. It depends on the sort of piece you have. I would use epoxy for more delicate pieces or cup handles. Hot glue is fine for kids pieces.
If the piece is raw clay, and you are not going to fire it in a kiln, there is nothing really satisfactory that will work. Raw clay will go back into wet clay if it is in contact with water, and has only ever been air dried. However, that being said, I have craft pieces I made 35 years ago, air dried, and painted with acrylic paint. Little bowls and ornaments and such. If something like this broke, I might try hot glue, as it isn't water soluable. Epoxy might work as well.
Believe it or not this website is devoted to glue: http://www.craftster.org/blog/?p=44 You put in what you are glueing to whatever else and it tells you the glue to use! Robyn
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