In this context, "beef" could refer to a complaint or gripe that someone has. It may suggest that someone is expressing dissatisfaction or dissatisfaction about something. The clue "Grouse" is potentially pointing towards the word "beef" as it can also mean a kind of game bird, similar to the grouse.
Note: The provided meaning of the answer is for the latest New York Times crossword puzzle clue: Grouse. Explanations are generated by AI and may be inaccurate.