1. The one who should have been 4th.
2. A headwear, a grip and an element reveal a king's best friend.
3. By another name, she is named after a jewel (estrangement).
4. Islandic river? It's the biggest.
5. The first ruler of Atlantis.
6. Fist of silver. The only decent fellow among his immediate kin.
7. A Vala and Turin meet, initially, in this place.
8. A girl who shares a name with a stream.
9. Third of this name. His people are devoted to Mahal.
10. An eager adventurer. Loved the sea.
11. Lady of Adamant. (Call).
12. Sheep land.
(Only one of the clues is cryptic. Have fun!

Also, I think you would like the first clue, Huey.