Related Clues:

• "Spartacus" author Howard
• Cue
• Promptly, on a memo
• PDQ
• "Don't dawdle!"
• "Hurry up," on memos
• Letters of haste
• In quick succession
• Memo acronym
• Firmly attached
• Pronto, on a memo
• Trump's "today!"
• 'On the double!'
• Reminder
• "Stat!"