He'll throw nothing out of the back door! (3)
I believe the answer is:
rod
This clue could be a double definition.
'he'll throw nothing' is the first definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.
'the back door' is the second definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Perhaps there's an association between them I don't understand?
'out of' is the link.
Can you help me to learn more?
(Other definitions for rod that I've seen before include "Stick; angler" , "Measurement" , "Stick - measure" , "Instrument of punishment" , "A few yards" .)