As in a clove of garlic, not the clove as in the spice. Cookpoint is smart enough to distinguish between these. This isn't an exact measurement, but people will know what you mean. That's about all this is used for. When the ingredient comes in envelopes as a package.
Yeast is a good example.
A glass, typically 3.5 ozs. But it's best to be more exact and say 3.5 ounces so that you don't risk confusing people. The metric unit of weight measure. The friendly English measure of length. Not used terribly often in recipes, but comes in handy when you want to specify the length of something like string or a stick of cinnamon.