Related Clues:

• Provide an endorsement
• It's immoral hiding gravity of warning
• "Stop," for one
• Firehouse feature
• Billboard, for example
• 11-Down, for one
• Do it on the dotted line
• Portent; notice
• __ vault
• The twins, say, communicate non - verbally
• Stick up for a European?
• Give your name to, as a gesture
• Notice; omen
• North, South and East European
• Give autograph as a gesture