Before revision:  Clustering reduces the coexistence threshold of the second strain and its outbreak size . We apply our model to the study of multilayer clustered networks and observe the fracturing of the residual graph experimentally .
After revision:  Clustering reduces the coexistence threshold of the second strain and its outbreak size in Poisson networks, whilst exhibiting the opposite effects on uniform-degree models. We conclude that clustering within a population must increase the ability of the second wave of an epidemic to spread over a network. We apply our model to the study of multilayer clustered networks and observe the fracturing of the residual graph experimentally .