As a detective, I would start by analyzing the given clue which states that we are looking for a runner named Sebastian who has won four Olympic medals. This immediately narrows down the possible answers to a select few. My next step would be to consider the most well-known athletes who have achieved this feat. A name that comes to mind is Sebastian Coe, a British middle-distance runner who has won four Olympic medals.
However, just having a name is not enough. I would need to confirm that Sebastian Coe fits the criteria of a “runner” and has indeed won four Olympic medals. I would use my investigative skills to research his background and track record. After a quick search, I discovered that Coe is not only a runner, but a highly accomplished one at that. He has won two gold and two silver Olympic medals in middle-distance running.
Putting all the pieces of the puzzle together, I arrived at the answer to the crossword clue as ‘COE‘. My thought process and insights allowed me to eliminate other possible candidates and arrive at the correct answer. It is always satisfying as a detective to solve a mystery, especially one that involves a clever wordplay such as a crossword puzzle.