undercover
OSTENSIBLE IDENTITY AND/OR ROLE OR POSITION IN AN INFILTRATED ORGANIZATION ASSUMED BY A COVERT AGENT
Cover (intelligence); Official cover; Nonofficial cover; Brass plate firm; Diplomatic cover; Non-official Cover; Noc list; Undercover; Non-official cover; Operational cover
undercover adj. тайный, секретный; undercover agent - тайный агент