The term 'has a yen for' is an idiom that means to have a strong desire or longing for something. The crossword solutions for this term are ACHES (5 letters), WANTS (5 letters), and CRAVES (6 letters). All three words can be used to describe the feeling of having a strong desire for something, but each word has its own subtle nuances. ACHES implies a physical or emotional pain associated with not having the desired thing, while wants implies a more general desire, and CRAVES implies a strong, almost obsessive need for the desired thing.