Related Clues:

• Without delay, in a memo
• 'Right away!'
• ''On the double!''
• With respect to
• Concerning, in memos
• Posthaste, briefly
• Respecting
• Memo header
• Reference preceder
• Letters akin to P.D.Q.
• Concerning, in legalese
• Brief phrase
• 'Stat'
• Request on a rush job
• In very short order