Lower-class gentleman producing blower in car (8)
I believe the answer is:
demister
This clue might be a double definition.
'lower-class gentleman' is the first definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.
'blower in car' is the second definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Maybe you can see an association between them that I don't see?
'producing' acts as a link.
Can you help me to learn more?
(Other definitions for demister that I've seen before include "one good at clearing" , "Device for removing condensation from a windscreen" , "One gives a clear view" , "control of car" , "Remover of condensation" .)