The crossword solution for the term 'conversion gadget' is 'adaptor'. An adaptor is a device that allows two different types of hardware or software to be connected together. It is commonly used to connect devices with different power sources, such as a laptop to a wall outlet, or to connect two different types of cables, such as an HDMI cable to a VGA cable. Adaptors are also used to convert digital signals from one format to another, such as converting audio from MP3 to WAV.