Alarm bell (6)
I believe the answer is:
tocsin
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">alarm bell</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I know that alarm bell can be written as tocsin)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for tocsin that I've seen before include "Alarm bell to be found in Scot" , "An alarm bell or signal" , "The sound of an alarm bell" , "alarm call" , "Con, sit and produce an alarmbell" .)