The word "sugar" is a noun that refers to a sweet, crystalline substance derived from various plants, commonly used as a sweetener in food and drinks. In the context of a "Diner caddy offering," it likely refers to individual packets or containers of sugar that are provided at a diner or restaurant for customers to add to their coffee or tea.
Note: The provided meaning of the answer is for the latest New York Times crossword puzzle clue: Sweet stuff in asparagus (if you read it backward)?. Explanations are generated by AI and may be inaccurate.