Recently we have investigated the cubic compound PrRhSn3 using the dc and ac susceptibilities and the heat capacity. We found an evidence for the cluster-glass behavior with a freezing temperature, Tf = 4.3 K. The frequency dependence of Tf is well described by the Vogel-Fulcher law with activation energy Ea = 21.3 K, and within the framework of critical slowing down, we estimated characteristic time constant 2.2 x 10^-10 s and critical exponent 10.86. All these results provide a strong evidence for the formation of a cluster-glass state in PrRhSn3. The specific heat reveals a crystal field (CEF) singlet ground state and a broad Schottky anomaly near 8 K. We believe that the origin of spin-glass behaviour lies in the dynamic fluctuations of the CEF levels as has been proposed for PrAu2Si2. We therefore propose to carry out INS study on PrRhSn3 using MARI.