Related Clues:

• Belgian port has succeeded for each end of port is satisfactory
• Replies to all four points in a Royal Society brief
• Responses; solutions
• Simple responses needed here
• Serves the purpose, since covering all the main points, right?
• Meets requirements for an empty grid?
• Comebacks? This side, they're going down!
• They cross in a crossword
• Makes a comeback
• Things in keys
• Comments from a crossword kibitzer
• Returns with one going down here
• Blank fillers, often
• Returns what you're looking for?
• A number of points arose, oddly neglected in explanations