The crossword solution for the term BE IN A LATHER is STEW, which is a four letter word. STEW is a type of dish that is made by simmering vegetables, meat, and other ingredients in a liquid such as broth or wine. It is often cooked slowly over low heat for an extended period of time, allowing the flavors to blend together. The phrase 'be in a lather' is used to describe someone who is in a state of agitation or excitement.