Electrical overload protector (4)
I believe the answer is:
fuse
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">electrical overload protector</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for fuse that I've seen before include "Weld together through heat" , "circuit-breaker" , "'Blend, merge (4)'" , "Safeguard in electrical circuit" , "Integrate" .)