The answers to the clues below will have something in common.

1. Having to do with insurance statistics and calculations
2. Having to do with men's clothing
3. Having to do with barbers
4. Like ET of film
5. Like many dogs
6. Changeable and fickle
7. Having to do with office work
8. Having to do with state leadership
9. Having to do with self-starting business ventures
10. Like many hand soaps
11. Like some DNA
12. Having to do with opposition

Answers:

1. Actuarial
2. Sartorial
3. Tonsorial
4. Extra-terrestrial
5. Territorial
6. Mercurial
7. Secretarial
8. Gubernatorial
9. Entrpreneurial
10. Anti-bacterial
11. Mitochondrial
12. Adversarial