"Wireless sensor nodes are composed of sensor nodes deployed in sensor fields. In this case Clone attacks happen easily in network. So many techniques are there to provide security for clone attack. The attackers can capture some of the node, take the information from them and replicate the nodes in a large number and then over all control of the network is taken by the attackers. In this paper, the authors propose a new detection algorithm for clone attack. They group distributed network into cluster and create the cluster head for all cluster. The algorithm is implemented in Network Simulator (NS) and the delay and throughput is compared. It is found that the network performance has improved by using this new detection algorithm."