What actor played a cook on ship but was an undercover cop?

You're likely thinking of "The Saint" starring Roger Moore in a 1962 episode called "The Saint in the Raw." In this episode, Simon Templar (played by Roger Moore) goes undercover as a chef on a ship called "The Raw" to investigate a murder.

Let me know if you'd like to know more about the episode or if you're thinking of a different actor!