The term CHIP SOURCE can be broken down into three crossword solutions: SPUD (4 letters), POTATO (6 letters), and IDAHOPOTATO (11 letters). SPUD is a slang term for POTATO, which is a starchy tuberous crop from the perennial nightshade Solanum tuberosum. Potatoes are a staple food in many parts of the world and are the main ingredient in chips, or French fries. Idaho potatoes are a variety of POTATO that is grown in the state of Idaho in the United States and are known for their high starch content, making them ideal for frying. Therefore, CHIP SOURCE can be interpreted as referring to potatoes, particularly Idaho potatoes, as the source of chips.