ACROSS

1 miras, 7 Kernowek, 8 leur, 10 gwysca, 12 edhen, 14 elgeth, 15 croust, 16 hir, 17 scubel, 19 hel

DOWN

1 medhegneth, 2 tansys, 3 our, 4 fetha, 5 lebmyn, 6 gonys, 9 cosel, 10 gwertha, 11 lebmel, 13 hernes, 18 colyn

Clue 3 Down could equally well be answered with eur 'hour (o'clock)'