I have found a unidentified TV in my Bluetooth list of items for pairing. Does this mean a possible hack attempt and how can I remove it from the list?
If it is in your list of devices that you have the option to pair with, then it simply means there is a TV near enough to your device, with Bluetooth turned on.
Unless you pair, it cannot access your data so nothing to be concerned about.
It just means someone near you like a neighbour or someone walking past your home has their Bluetooth enabled, I live in a flat and often see my neighbours TVs, phones on my Bluetooth list when I search.