The term FRY SOURCE is composed of two words, 'FRY' and 'SOURCE'. FRY is a cooking method in which food is cooked in hot oil or fat. SOURCE refers to the origin or cause of something. Together, the term FRY SOURCE can be interpreted as the origin of frying, or the SOURCE of frying. The crossword solutions for this term are SPUD (4 letters) and TATER (5 letters). A SPUD is a slang term for a potato, and a TATER is another slang term for a potato. Therefore, the crossword solutions for FRY SOURCE are both potatoes, which are a popular food item that is often fried.