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

1. Diploma
2. Western
3. Panacea
4. Computer game
5. Low tech correspondence
6. Danish cousin
7. Insincere weeping
8. Something to think about
9. Home invader
10. Emergency
11. Sure thing
12. Nose job

Answers:

1. Sheep skin
2. Horse opera
3. Snake oil
4. Spider solitaire
5. Snail mail
6. Bear claw
7. Crocodile tears
8. Bug in your ear
9. Cat burglar
10. Ox in the mire
11. Bird in the hand
12. Rhinoplasty