1) Alarm 2) Alarm bell 3) Alarum 4) Alert 5) French word used in English 6) Poisonous-sounding alarm bell 7) The sound of an alarm 8) Warning bell 9) Warning signal Found on https://www.crosswordclues.com/clue/tocsin
Toc'sin noun [ French, from Old French toquier to touch, French toquer (originally, a dialectic form of French toucher ) + seint (for sein ) a bell, Late Latin signum , from Latin signum a sign, signal. See Touch , and Sign .] An alarm ... Found on http://www.encyclo.co.uk/webster/T/64