Wordspiral

CLUES: 1. Fall in drops 2. Shove 3. Cards dealt to a player 4. Aquatic bird 5. Slay 6. Den 7. Control or government 8. Resound 9. Unlock 10. Christmas 11. Noisy 12. Action 13. Site for depositing rubbish 14. Walk heavily 15. Romantic appointment 16. At any time. Key word clue: Gemstone.