The term LEAK SOURCE can be broken down into three crossword solutions: FAUCET (6 letters), INSIDER (7 letters), and URETHRA (7 letters). A FAUCET is a device used to control the flow of a liquid, such as water, and is often found in sinks and bathtubs. An insider is someone who has access to confidential information, such as a person with knowledge of a company's inner workings. Finally, the urethra is a tube that carries urine from the bladder to the outside of the body. All three of these solutions can be considered sources of a leak, whether it be a literal leak of water or a figurative leak of confidential information.