Roadie's load (3)
I believe the answer is:
amp
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">roadie's load</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 amp that I've seen before include "Sound-boosting piece of equipment (abbr)" , "Map of electrical unit" , "Physics unit" , "It helps you hear" , "sound is increased by this" .)