MANET is a self-configuring network of mobile nodes connected by wireless links and driven by battery power. Security and Energy are the two prime concerns in Mobile Ad hoc Networks (MANET). Intrusion Detection System (IDS) is one of the ways to provide security in MANET. Due to energy crisis, it is not possible to run an IDS throughout the life-time of MANET. Therefore IDS should be run in time sharing fashion in a cluster based MANET. In this paper a novel scheduling strategy is described, which will run all the IDS in a time shared fashion in a clique. This will help in conserving energy while giving desired level of security.