Workers in apartment take possession of one part of a bulb (8)
I believe the answer is:
filament
'one part of a bulb' is the definition.
('filament' is part of 'bulb')
'workers in apartment take possession' is the wordplay.
'workers' becomes 'men' (men can mean staff or employees).
'in' indicates putting letters inside.
'apartment' becomes 'flat' (synonyms).
'take' indicates putting letters inside.
'possession' becomes 'i' (I can't explain this - if you can you should believe this answer much more).
'men' put into 'flat' is 'flament'.
'flament' placed around 'i' is 'FILAMENT'.
'of' is the link.
Can you help me to learn more?
(Other definitions for filament that I've seen before include "Fine thread" , "Strand" , "It glows in a light bulb" , "'Thin wire, in a bulb say (8)'" , "Part of light" .)