Definition of clot. 1  1 : a portion of a substance adhering together in a thick nondescript mass (as of clay or gum) 2  2a : a roundish viscous lump formed by coagulation of a portion of liquid or by meltingb : a coagulated mass produced by clotting of blood. 3  3 British : blockhead.  4 : cluster, group a clot of spectators.
Depending on how cooked you like your hard boiled eggs, the eggs should be done perfectly in 10-12 minutes. That said, depending on your altitude, the shape of the pan, the size of the eggs, the ratio of water to eggs, it can take a few minutes more.
If the internal temperature of the yolk is between 158 to 170 degrees F, they are fully cooked and ready to be removed from the heat source. See also > The Food Lab: The Hard Truth About Boiled Eggs. This is only a guideline, but it should take between 11 to 13 minutes for a hard-boiled egg.