An undercover agent who is given no official cover(noun)
WordNet. Princeton University. 2010.
Use "noc" in a sentence
"So this year, even before she was outed, she was moving away from "noc" - which means non-official cover, like pretending to be a business executive."
"They have a huge "noc" presence according to what our intelligence agencies analyze."
"There are any number of non-official cover or "noc" spice posing as business people, posing as journalists, posing as, you know, academics or students and those individuals are even harder to track."