Ringer (4)

I believe the answer is:
bell
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">ringer</span>' is the definition.<br/ ><span class="explanation-format__explanation">(a bell rings)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for bell that I've seen before include "Tinkler" , "eg Big Ben" , "Wide end of a trumpet" , "Alexander ..., inventor of the telephone" , "It makes a ringing sound when hit with a clapper" .)