Banger with rust corrosion (5)
I believe the answer is:
wurst
'banger' is the definition.
(I've seen this before)
'with rust corrosion' is the wordplay.
I cannot really understand how this works, but
'with' could be 'w' (short for with) and 'w' is found in the answer.
an anagram of 'rust' is 'urst' which is located in the answer.
This accounts for all the letters.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for wurst that I've seen before include "fare from Berlin" , "Banger" , "Large German or Austrian sausage" .)