The term 'SUDS SOURCE' can be broken down into five crossword solutions: PUB (3 letters), TAP (3 letters), BREWERY (7 letters), KEG (3 letters), and SOAP (4 letters). A PUB is a public house, which is a drinking establishment that serves alcoholic beverages. A TAP is a device used to dispense beer from a KEG. A brewery is a facility where beer is produced. A KEG is a cylindrical container made of metal or wood that is used to store and transport beer. Finally, SOAP is a cleansing agent made from the salts of vegetable or animal fats.