Related Clues:

• 40-Across, e.g.
• Trump's "today!"
• Without hesitation
• 'On the double!'
• On the double!
• E.R. order
• Immediately, to a surgeon
• "Stat!"
• P.D.Q. in the I.C.U.
• Memo letters
• ER order
• ER command
• Diamond datum
• 'Quickly!'
• Bit of data