Related Clues:

• Write in the margins
• Tiniest amount
• Make a note
• Illegible jotting
• Make marginal notes
• Write (down)
• Compose quickly, as a note
• Write to
• Make a note of (with "down")
• Tiny bit (NOTE: The hidden generals in last week's puzzle were: (North) Grant, Sher-idan, Meade, Cus-ter, Burns-ide, Sherman, and Hook-er; and (South) For-rest, Early, Pic-kett, Stu-art, Longs-treet, Jacks-on, and Lee.)
• Write hastily - a very small amount
• Write a short note
• Perhaps allow 9 across to fall from your pen
• Let it fall into the post
• Does it befall that you will write a letter?