The term 'CAN OPENER OF A SORT' can be solved by the three-letter word 'TAB'. A TAB is a type of can opener that is used to open cans of food. It is a small metal device with a sharp point that is inserted into the top of the can and then pulled back to create an opening. This type of can opener is often found in kitchens and is a convenient way to open cans of food without having to use a knife or other tool.