Worker never affected by nasty smell in trash (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')
'never affected by nasty smell in trash' is the wordplay.
I cannot quite understand how this works, but
'smell' could be 'bo' (abbreviation for Body Odour) and 'bo' is present in the answer.
The remaining letters 'rot' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for robot that I've seen before include "performer lacking emotion" , "Humanoid machine" , "Automatic worker?" , "Computer-controlled machine" , "Automatic machine" .)