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

1. Open ocean
2. Sensitive and tense
3. Expensive and well-made
4. Well-known or publicized
5. Old style dresser
6. Using sophisticated electronics
7. Emphasize
8. Feeling good
9. On a roll
10. Informal congratulations
11. Signal, often secret
12. It can spoil you sand castle
13. Circus thriller
14. Unavoidable confrontation
15. Stranded
16. Everywhere
17. Arrogant
18. None too soon
19. Overbearing and arrogant
20. Expensive neighborhood
21. Informal gesture of celebration

Answers:

1. High seas
2. High-strung
3. High-end
4. High profile
5. Highboy
6. High tech
7. Highlight
8. In high spirits
9. In high gear
10. High-five
11. High sign
12. High tide
13. High wire
14. High Noon
15. High and dry
16. High and low
17. High and mighty
18. High time
19. High hat
20. High-rent
21. High-five