Related Clues:
- Postage-paid enclosure: Abbr.
- Mind duller
- Manuscript enclosure: Abbr.
- Epistolary courtesy
- It may hold a rejection slip, briefly
- Religion, in an oft-quoted metaphor
- Enc. for response
- Stimulant's opposite
- Letter insert, briefly
- Item with a MS.
- It's a downer
- MS accompanier
- Codeine, e.g.
- Invitation encl.
- Part of an author's submission: Abbr.