SPIRAL

Starting from 1, fill in the grid clockwise with four-letter words. The last letter of each word becomes the first letter of the next to reveal the seven-letter key word in the shaded boxes.

1. Weaving machine 2. Flying insect 3. Difficult 4. Sunset 5. Eager 6. Lighting gas 7. Title 8. Famous school

10. 9. Require Uninteresting 11. Sediment 12. Settee 13. Military force 14. Unit of length 15. Moist 16. Lord

Keyword clue:

A gemstone