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

1. Leader of a flock of sheep
2. Concussion
3. Hotel employee
4. Iconic American history relic
5. The devil's in the details
6. Familiar
7. Avoid disaster at the last moment
8. Normal distribution in statistics
9. Frills and excesses
10. Weight-lifting equipment
11. Clothing fashion of the '60's
12. What the "fine lady" of Banbury Cross wore

Answers:

1. Bellwether
2. Ring my bell
3. Bellhop
4. Liberty Bell
5. Belling the Cat
6. Rings a bell
7. Saved by the bell
8. Bell curve
9. Bells and whistles
10. Barbell
11. Bell-bottoms
12. Bells on her fingers