Light bulb part (8)
I believe the answer is:
filament
'light bulb part' is the definition.
('filament' is part of 'light bulb')
This is all the clue.
(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" .)