Related Clues:

• On the topic of
• About a twisted rein
• 'Relating to the matter of the rein (2,2)'
• "Now, about ..."
• About, memo-style
• Words often before a colon
• On the topic of, briefly
• Concerning wild oats
• Concerning, having flipped a bit?
• Brief start
• About, memowise
• Pertaining to, briefly
• About, on memos
• Memo lead-off
• Brief opening