Be careful, to not think of clone (incl. monozygotic twin) as individuals that look exactly alike or behave exactly alike. read more
And when the embryo splits to form identicle twins, a clone is created. It is just that it was created by a natural event. Yit's mention of twins being "separate beings" is not relevant because clones are also separate beings - Dolly the sheep was a separate being from the sheep that donated her starting DNA. read more
A clone is an individual that is genetically identical to another (see wikipedia > cloning). As you said, identical twins (better called monozygotic twins) are genetically identical to one another and therefore an identical twin is a clone indeed. The role of the environment Be careful, to not think of clone (incl. read more
Identical twins are considered as natural clones. 2. Twins result from the natural splitting of one zygote or the fertilization of two ova while clones are a result of the harvesting of a foreign somatic cell or foreign ovum from a donor and then later having it implanted into a surrogate mother, usually enhanced or engineered with the DNA of another donor. read more