Across: 1 have on, 4 academia, 9 merry, 10 christmas, 11 true, 12 joss, 13 holly, 15 waspish, 16 nark, 19 news, 20 heedful, 23 jolly, 24 acme, 25 oops, 27 bubble gum, 28 berry, 29 artistry, 30 gateau;
Down: 1 hometown, 2 virtuoso, 3 onyx, 5 chrysanthemum, 6 discharged, 7 mumble, 8 assays, 10 clothes hanger, 14 life cycles, 17 of course, 18 bless you, 21 Ojibwa, 22 all but, 23 abba