CRYPTIC CROSSWORD No. 16,825

ACROSS: 1 Restructure. 9 Rebuild. 10 Earache. 11 Ova. 12 Hangman. 13 Niggard. 14 Sac. 15 Cameo. 17 Tease. 18 Bleep. 20 Rumba. 22 Ill. 24 Meccano. 25 Satanic. 26 Run. 27 Secrete. 28 Install. 29 Doublespeak. DOWN: 1 Ribonucleic acid. 2 Seismic. 3 Radon. 4 Clean room. 5 Upright. 6 Exclamation mark. 7 Brahms. 8 Peddle. 16 Marmoreal. 18 Bemuse. 19 Plateau. 21 Artiste. 23 Locale. 25 Snips.