You're almost entirely correct. They clone individuals (gholas) and raise them in "tanks" which are basically women in a much worse situation than Handmaid's Tale. The clone in question was Teg Atreides who was the Bashar (General) for the Bene Gesserit. They normally awakened memories in gholas through stress but he was very young when they needed him to manage their forces. There was a suggestion about using sex instead which produced a long moral discussion about the use of sex vs violence. They went with sex and it worked.