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.
I always bring the water up to a boil and then put the eggs in. I let them cook until one of the cracks or for about 7 mins. an egg takes about 15-20 minutes to boil. Boil the water, then put the eggs in for 10 mins.