Cheque Truncation System (CTS) is a cheque clearing system undertaken by the Reserve Bank of India (RBI) for faster clearing of cheques. As the name suggests, truncation is the process of stopping the flow of the physical cheque in its way of clearing. In its place an electronic image of the cheque is transmitted with key important data.
Cheque truncation thus obviates the need to move physical instruments across branches. This effectively eliminates the associated cost of movement of physical cheques, reduces the time required for their collection and brings elegance to the entire activity of cheque processing. It is a system which is practised worldwide in the banking sector.

CLG means Clearing House Transaction.If you see CLG in statements you can conclude it is a clearing transaction .