A more thorough explanation:

Definition: A feigned accomplice is someone who pretends to be involved in a crime or illegal activity in order to gather information and report it to the authorities. This person is also known as an informant.

Example: A police officer may ask someone to act as a feigned accomplice in a drug bust. The person would pretend to be a drug dealer or buyer in order to gather information about the illegal activity and report it to the police.

Explanation: The example illustrates how a feigned accomplice works. The person is not actually involved in the illegal activity but pretends to be in order to gather information. This information is then used by the authorities to make arrests and stop the illegal activity.