Related Clues:

• Catchy communication, for short?
• Guard's order
• Sentry’s cry
• 'Company, ___!'
• "Stop!" to a sentry
• NYPD advisory
• Sentry’s shout
• Police alert, in brief
• Stop husband getting key
• Check hotel key
• Military order to stop
• Come to an abrupt stop
• PD advisory
• "Come no further"
• Stop, to a sentry