Get into a lather is an idiom which means to become very agitated or angry. The crossword solutions for this term are SOAP (4 letters), STEW (4 letters), and SOAPUP (6 letters). SOAP is a cleansing agent made from fats and oils, usually in the form of bars or liquid. STEW is a type of soup or broth made by combining various ingredients and cooking them slowly over low heat. SOAPUP is a verb meaning to wash with SOAP.