Trolley sound (5)
I believe the answer is:
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">trolley sound</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for clang that I've seen before include "Resounding effect" , "Harsh cry" , "Noise as of cymbals" , "Ring like a bell" , "A loud ringing sound" .)