In the Internet of Things (IoT), it is desirable that every IoT device will be capable to communicate with the network at any time. Among various technologies to enable network connectivity, the Long Term Evolution (LTE) is by far the most ubiquitous technology to provide large coverage of IoT devices. Machine-Type Communications (MTC) is seen as a major service in the next generation cellular mobile networks for IoT. However, the predicted large number of MTC devices will overload the Radio Access Network (RAN), with impact on non-MTC devices. In this work, we propose a design of a RAN overload control mechanism based in clustering that is exclusively engineered for delay-tolerant MTC devices. The proposed solution is intended for delay-tolerant MTC devices with a Radio Resource Control (RRC) context (have a Cell Radio Network Temporary Identity (C-RNTI)) but without being synchronized with the network. By simulation, we show that the proposed scheme leads to acceptable collision levels, besides ameliorating the energy efficiency.