Arm waving in front of driver with decapitated snake (5)
I believe the answer is:
wiper
'arm waving in front of driver' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Perhaps there's a link between them I don't understand?
'with decapitated snake' is the wordplay.
'with' becomes 'w' (short for with).
'decapitated' means to remove the first letter.
'snake' becomes 'viper' (viper is a kind of snake).
'viper' with its initial letter taken off is 'iper'.
'w'+'iper'='WIPER'
Can you help me to learn more?
(Other definitions for wiper that I've seen before include "Feature of car" , "Windscreen cleaner" , "contact in the electrical world" , "Something to eradicate" , "car accessory" .)