Issue 15 Answers:

Across:
1. Talk
3. Elf
6. QANAT
8. Winning
10. aa
12. countertenor
14. Bezique
15. Xi
17. Kosovo
19. Bowstrings

Down:
1. THX
2. Leak
4. Flapjack
5. Zax
7. Aeire
9. Muzjiks
11. Jukebox
13. Void
16. Joust
18. Ying