Cleraun is a university centre and residence for third-level students. It has study rooms, lecture and seminar facilities, which are open to non-resident students. Since it opened in 1982, Cleraun has organised many cultural and educational activities for students. Guest speakers are regularly invited for discussions on topical issues.
Since 1992 Cleraun has been bringing university students and young professionals to some of the poorest parts of the developing world, giving them an opportunity to work in collaboration with local communities. Some of these aid projects took place in rural areas of Uganda and in the Andes mountains of Peru. Work involved helping with the building of primary schools, health centres and other social facilities. More recent projects have been in Russia and the Baltic countries.
Cleraun has a small oratory and a resident chaplain. Doctrinal and spiritual activities are entrusted to Opus Dei, a prelature of the Catholic Church founded in 1928 by Saint Josemaría Escrivá. Opus Dei aims to help people from all walks of life to live up to their calling as Christians and to strive for holiness in and through their everyday work.