Cloning is taking a cutting off a plant, rooting and growing it. It should be done when the plant is in veg. Curing is a technique that makes pot smoke cooler, taste and smell better, and increases potency. It should be done when the buds are manicured and almost dry enough to smoke.
A little advice... Only clone your plant if it's a good strain. And remember the golden rule! Males must be kept seperate from all the beautiful females and their goddliness. ::sigh::