| Brain-scan letters |
| Short vinyl recordings: Abbr. |
| All, e.g., for this answer's last six letters? |
| Archaeologist's letters |
| Recording charges |
| Organizations with Greek letters |
| Confusing statements ... and a hint to the circled letters |
| High-speed pursuits in action films |
| Action shots taken with a slow shutter speed |
| Attend a party uninvited ... and a literal hint to five sets of circled letters |
| Surprises unpleasantly, and a hint to each starred answer's first two + last two letters |
| Wakes thrown up behind speedboats |
| Accompaniers of cover letters: Abbr. |
| Adjust space between letters, in printing |
| Amtrak speedsters |
| Letters from the family? |
| Brain wave recording: Abbr. |
| Retirement plan letters |
| Personal letters |
| Bounced-check letters |
| Whatever it takes ... as hinted at in the arrangements of black squares around the circled letters |
| Early computer printer speed meas. |
| Advances recording costs |
| Hi-speed internet connection |
| Old recorder of beastly behavior |
| Ledger for recording transactions as they occur |
| Tape-recorder spindle |
| ICU instruction letters |
| Letters preceding an assumed name |
| Boston-to-Washington speedster |