Workers in a given ant colony - really, daughters of the same mother in any hymenopteran species, all of which use haplodiploid sex determination - are more closely related than siblings in species with fully diploid sex-determination systems, but they're not clones.
Man o Wars are also not disjoint. They have specialized cells, but I believe share nutrition among the non-feeding cells. A truly disjoint creature would need a metabolic system on both sides of the disjoint, a separate nervous system, and perhaps most difficult, a way to pass messages across the disjoint quickly enough to be useful (aka electric impulse).
At a certain point, I think it starts becoming dubious whether it's a single creature. Even if they're genetically identical, they start to look more like twins than a colonial creature.