WORD 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 a musical instrument.

1. Potato

2. Unable to hear

3. Costing nothing

4. School test

5. Facial disguise

6. Tangle

7. Ballet skirt

8. Second-hand

9. Flat circular object

10. Fossil fuel

11. Jump

12. Ceremonial splendour

13. Prod

14. Flightless birds

15. Appear

16. Loose scrum