Sausage in an old car (6)
I believe the answer is:
banger
This clue is a double definition.
'sausage' is the first definition.
(banger is a kind of sausage)
'an old car' is the second definition.
(slang for an old, dilapidated vehicle)
'in' acts as a link.
(Other definitions for banger that I've seen before include "Old car (colloq.)" , "Old rattling car or slang sausage" , "Noisy old car or slang sausage" , "Sausage, firework and old car" , "Meaty" .)