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

1. Contest or get-together focused on a common interest
2. Red, Yellow, or Black
3. $1,000
4. First-person pronoun
5. A kind of bird
6. A small island
7. Raised railway or building annexation
8. Type width
9. Type width
10. A line or prompt
11. Kind of road curve
12. Hot beverage or golfing device
13. Second-person pronoun
14. Sign of triumph
15. Question word

HINT:
It has to do with the sound of letters.

Answers:

A single letter can have the sound of the clue's answer:

1. B
2. C
3. G
4. I
5. J
6. K (cay)
7. L (el or ell)
8. M
9. N
10. Q (queue or cue)
11. S (ess)
12. T
13. U
14. V
15. Y