Worker that's turned on by stink-infested rubbish (5)
I believe the answer is:
robot
'worker' is the definition.
(I have seen 'Soulless worker' mean 'robot' so perhaps 'worker' could also mean 'robot')
'stink-infested rubbish' is the wordplay.
'stink' becomes 'BO' (body odour).
'infested' indicates putting letters inside (some letters are infested with others).
'rubbish' becomes 'rot' (both can mean nonsense).
'bo' going into 'rot' is 'ROBOT'.
'that's turned on by' is the link.
This may not be correct. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for robot that I've seen before include "Unpaid worker" , "Automaton or sci-fi creature" , "Computer-controlled machine" , "Mechanism that moves automatically" , "Automatic worker?" .)