Answer: topsecret
AnswerCrossword Clue
TOPSECRETNot to be disclosed.
TOPSECRETUpper-level security clearance status
TOPSECRETOn a need-to-know basis
TOPSECRETPhrase often stamped in red
TOPSECRETClassified
TOPSECRETTrained street cop to be covert (3-6)
TOPSECRETKnown to next to none
TOPSECRETLike the Manhattan Project
TOPSECRETPopular official stamp
TOPSECRETClassified.
TOPSECRETVery hush-hush.
TOPSECRETClearance level
TOPSECRETHush-hush.
TOPSECRETStrictly hush-hush.
TOPSECRETVery hush-hush
TOPSECRETFor certain eyes only
TOPSECRETHush-hush
TOPSECRETHighly classified
TOPSECRETLike many briefings Obama is privy to
TOPSECRETLike an eyes-only document, say
TOPSECRETClandestine
TOPSECRETHighest level of classified information