| Answer | Crossword Clue |
|---|---|
| SASE | Letter insert, briefly |
| ENC | Letter insert: Abbr. |
| SASE | Freelancer's insert, briefly |
| MIC | Jack insert, briefly |
| ORIG | Copy-machine insert, briefly |
| SIG | Frat letter, briefly |
| ENC | Letter inclusion, briefly |
| PSS | Letter additions briefly |
| CCED | Sent a duplicate letter to, briefly |
| PPS | Second addendum to a letter, briefly |
