Solution to General Knowledge Crossword No. 690

Across: 1 Toper, 4 Tacamahac, 9 Monodrama, 10 Geode, 11 Style, 12 Cup-bearer, 13 Spurtle, 15 Keratin, 17 Marxist, 19 Windrow, 21 Designers, 23 Stela, 24 Scent, 25 Mardi Gras, 26 Notoriety,27 Godet

Down: 1 Tamesis, 2 Pennymuir, 3 Radge, 4 Tranche, 5 Champak, 6 Magnetron, 7 H-hour, 8 Chevron, 14 Tailgater, 16 Turkey red, 17 Madison, 18 Thermae, 19 Westray, 20 Whatsit, 22 Sheet, 23 Sting