Meaning of AGENT in English

AGENT

provocateur [noun] [C] - a person who is employed by the government, police, etc., to encourage people thought to be criminals or people who are working against the government to perform an illegal act so that they can be caughtThe leader of the riot was later discovered to have been an agent provocateur planted by the police.

Cambridge English vocab.      Кембриджский английский словарь.