Related Clues:

• Reply courtesy, briefly
• Ed.'s request
• Enclosure with a MS.
• Postpaid encl.
• Return mailer: Abbr.
• Letter encl.
• Inclusion with a MS.
• Returned MS holder
• Sleep-inducing
• Freelancer's enc.
• Request from an ed.
• Polite encl.
• Elysium
• Freelancer's encl.
• Postpaid enc.