| School subject: Abbr. |
| Brain-scan letters |
| All, e.g., for this answer's last six letters? |
| Archaeologist's letters |
| Artists' subjects |
| Organizations with Greek letters |
| Confusing statements ... and a hint to the circled letters |
| Dian Fossey subjects |
| Cannes subject |
| Surprises unpleasantly, and a hint to each starred answer's first two + last two letters |
| Alien subject?: Abbr. |
| Like a "before" versus "after" photo subject, say |
| Accompaniers of cover letters: Abbr. |
| Ned Buntline dime novel subject |
| Attend a party uninvited ... and a literal hint to five sets of circled letters |
| Adjust space between letters, in printing |
| Inflation subject? |
| Personal letters |
| Whatever it takes ... as hinted at in the arrangements of black squares around the circled letters |
| Acute subject? |
| Letters from the family? |
| Retirement plan letters |
| Bounced-check letters |
| Letters preceding an assumed name |
| ICU instruction letters |
| Attila's subjects |
| Artistic place for tiny letters? |
| AP physics subject? |
| A Gunther subject |
| With "a," someone undesirable ... and what's found in the circled letters? |