The crossword solution for the term 'Propeller of a Sort' is OAR, which stands for oarlock. An oarlock is a device used to attach an OAR to a boat, allowing the oarsman to propel the boat forward. It is usually made of metal and consists of two parts, one of which is attached to the boat and the other to the OAR. Oarlocks are commonly used in rowing boats, but can also be found in other types of boats.