Historical clue formulations

• Old-fashioned invitation enclosure, in brief — 2025-08-24
• R.S.V.P. convenience — 2024-07-25
• Wedding invitation enclosure, in brief — 2022-10-02
• Enclosure for a slush pile, for short — 2019-12-15
• It's often included with an R.S.V.P. card — 2019-12-08
• Onetime MS. accompanier — 2019-08-25
• Ed.'s convenience — 2018-12-14
• Ed.'s request — 2017-06-04
• Autograph collector's enclosure, for short — 2017-04-19
• Aid for an ed. — 2017-02-18
• Slush pile item, for short — 2015-06-27
• Junk mail encl., sometimes — 2013-06-27
• It may have a row of 28-Down, briefly — 2013-04-13
• Author's encl. — 2013-01-27
• Autograph collecting aid, for short — 2012-06-21
• Response facilitator: Abbr. — 2012-05-18
• Ed.'s convenience — 2011-08-21
• Manuscript encl. — 2011-05-17
• Mailing courtesy, briefly — 2011-03-11
• Aid in answering: Abbr. — 2009-10-31
• A MS. might come back in it — 2009-05-05
• Postpaid encl. — 2009-01-13
• MS. enclosure — 2008-12-23
• Encl. with a manuscript — 2008-08-18
• Manuscript encl. — 2008-07-13
• Response facilitator: Abbr. — 2008-04-25
• Enclosure with a MS. — 2008-04-07
• Manuscript encl. — 2007-11-28
• Encl. to facilitate a response — 2007-07-26
• MS. accompanier — 2007-05-23
• MS. enclosure — 2007-04-25
• Postpaid encl. — 2006-05-21
• It may be used for many unhappy returns: Abbr. — 2005-12-09
• MS. enclosure — 2005-11-28
• Response facilitator: Abbr. — 2005-08-26
• Postpaid encl. — 2004-11-28
• Encl. with a manuscript — 2004-04-12
• Convenience for an ed. — 2004-02-12
• Business letter encl. — 2003-12-15
• Freelancer's encl. — 2003-10-15
• MS. enclosure — 2003-05-21
• Mail convenience: Abbr. — 2003-03-21
• It may accompany a MS. — 2003-03-20
• Enclosure with a MS. — 2002-06-03
• Postpaid encl. — 2002-05-26
• Polite encl. — 2001-03-07
• It has your name on it: Abbr. — 2000-09-16
• Ed.'s request — 2000-08-19
• Ed.'s request — 2000-08-12
• MS. inclusion — 2000-02-13