Type of road rage evident in decrepit car (6)
I believe the answer is:
banger
'decrepit car' is the definition.
'banger' can be an answer for 'car' (I have seen 'Old car ' mean 'banger' so perhaps 'car' could also mean 'banger'). I am not sure about the 'decrepit' bit.
'type of road rage' is the wordplay.
'type of road' becomes 'b' (I am not sure about this - if you are sure you should believe this answer much more).
'rage' becomes 'anger' (I've seen this before).
'b'+'anger'='BANGER'
'evident in' is the link.
Can you help me to learn more?
(Other definitions for banger that I've seen before include "Old rattling car or slang sausage" , "Clapped-out car" , "Old and unreliable car" , "Noisy old car or slangy sausage" , "Sausage, firework and old car" .)