Admonition to a cinema gabber
Else clues• 'Keep quiet!'
• Be quiet!
• No noise! noise
• Pipe down!
• Quiet please!
• Quiet!
• Command in a library
• Comment on a library volume?: Var.
• Disruptive theater patron's comeuppance: Var.
• Librarian's admonition
• Librarian's warning
• Library sound: Var.
• Secure Internet connection protocol letters
• Secure online protocol
• Sibilant silencer
• Silence!
• Sound barrier?: Var.