The crossword solution for the term 'Potter Professor Severus ___' is Snape (5 letters). Severus Snape was a professor at Hogwarts School of Witchcraft and Wizardry in the Harry Potter series. He was a Potions master and Head of Slytherin House. He was also a double agent, working for both Voldemort and Dumbledore. Snape was known for his cold and harsh demeanor, but he was ultimately loyal to Dumbledore and the Order of the Phoenix.