Related Clues:

• Reply courtesy, briefly
• Ed.'s request
• Enclosure with a MS.
• Codeine, for one
• Writer's Market abbr.
• Postpaid encl.
• Return mailer: Abbr.
• Letter encl.
• Narcotic
• Inclusion with a MS.
• Poppy plant derivative
• Downer
• Chloral hydrate, e.g.
• Calmer
• Returned MS holder