"the conception and planning of an offense by an officer, and his procurement of its commission by one who would not have perpetrated it except for the trickery, persuasion, or fraud of the officer" best describes which term?

The correct answer is entrapment. That's basically when an officer tricks a person into committing a crime or into participating in a crime, that the person normally would not commit or does not know that is a crime, with the goal of either helping the officer or pinning the crime on someone or similar things.