Stumped by a storm of swear words? This crossword clue has the answer (only 60 characters!)

The answer to the crossword question “Swearing up a storm, say is CRASS” is the word “vulgar,” which means lacking sophistication or good taste, and typically refers to behavior that is offensive, rude, or inappropriate. The clue suggests someone who is swearing excessively, which is seen as crass or offensive. Therefore, the answer “vulgar” fits the description of the behavior and response suggested by the clue and is correct.