Answer:

secrecy

Answer	Crossword Clue
SECRECY	Covert operations need
SECRECY	Result of sealed lips
SECRECY	Stealth

SECRECY	Requirement for a surprise party
SECRECY	Veil of -
SECRECY	Concealment.
SECRECY	Elopers' concern.
SECRECY	Spy's byword
SECRECY	Requirement for surprise
SECRECY	Opposite of openness
SECRECY	Private practice?