Links between role and organizational citizenship behaviour (OCB) were already signalled in early studies. However, empirical validation on the relation between the two is still unavailable. Inspired by the theory of social exchange, this study explores the relation between role clarity and OCB’s dimensions in the Indian power sector. To further the analysis, the relation was moderated with tenure levels. This study is based upon the responses gathered from 300 Indian executives. Higher statistical tools, such as Bonferroni method, path analysis and subgroup analyses, are deployed with help of multiple group confirmatory factor analysis (MGCFA) to record the validated results. A significant relationship was found between role clarity and OCB dimensions. While, OCB dimensions recorded mixed results across tenure stages, they showed a general trend of increased score on higher tenure stage with role clarity as independent variable. Also, public organizations scored better than the private organizations on role clarity–OCB dimensions relationship. Findings along with implications and future scope are discussed in this article.