Related Clues:

• Word on an urgent message
• Without delay, in a memo
• Any time now
• Casting director's dismissal
• 'Right away!'
• ''On the double!''
• Closest
• Soon enough
• In a little bit
• Author unknown, for short
• Nearest in space or position
• Posthaste, briefly
• Barber's invitation
• Vaccinator's call
• Prolific auth.