| Answer | Crossword Clue |
|---|---|
| REV | Head of a flock: Abbr. |
| CLERIC | Head of a flock |
| PERS | Head of a PIN?: Abbr. |
| ENGR | Head of a train: Abbr. |
| CEO | Head of a board: Abbr. |
| NASIO | Of a head part: Abbr. |
| MESSRS | Abbr. at the head of a letter |
| MESSRS | Abbr. at the head of a letter, sometimes |
