Methods for long-distance time and frequency transfer over optical fibres have demonstrated excellent performances and are evolving rapidly. CLONETS is a new European Union-funded coordination and support action intended to accelerate the transfer of these technologies to industry and to strengthen the coordination between research infrastructures and research and education network providers, in order to prepare the deployment of this technology for a sustainable, pan-European fibre network, providing high-performance clock services for European research infrastructures and supporting wider services for industry and society.