ACROSS
2 pluven, 3 try, 6 tanow, 7 aval, 9 ober, 10 lînednor, 11 cales, 13 myttyn, 16 defendyor, 19 Kernow, 20 pebor, 21 gans
DOWN
1 avorow, 2 pùscador, 4 comolek, 5 daras, 8 melyn, 12 loder, 14 yêyn, 15 howlek, 17 terrys, 18 gwyns
Note that the first and second editions of the Skeul an Tavas coursebook wrongly spells defendyor 'eraser' as dyfendyor.
Clue 18 Down was a wild one, because gwyns 'wind' does not appear until Lesson 17. But you learned gwynsak 'windy' in Lesson 2. Did you guess the answer correctly?