Light bulb part (8)
I believe the answer is:
filament
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">light bulb part</span>' is the definition.<br/ ><span class="explanation-format__explanation">('filament' is part of 'light bulb')</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for filament that I've seen before include "One may be incandescent" , "Slender fibre or wire" , "It glows in a light bulb" , "Fine thread" , "Thin thread or fibre" .)