The term 'Bit of Plumbing' refers to a job that involves the installation and maintenance of pipes. The crossword solution for this term is 'PIPE, ' which is a four-letter word. Pipes are used in plumbing systems to transport water, gas, and other liquids from one place to another. They are also used to connect fixtures such as sinks, toilets, and showers. Plumbers use a variety of tools and techniques to install and maintain pipes, including soldering, threading, and welding.