Bounder has to ring one back to get a car (8)
I believe the answer is:
cadillac
'a car' is the definition.
(I've seen this before)
'bounder has to ring one back' is the wordplay.
'bounder has' becomes 'cadi' (I can't explain this - if you can you should give a lot more credence to this answer).
'to ring' becomes 'call' (synonyms).
'one back' says the letters should be written backwards.
'call' back-to-front is 'llac'.
'cadi'+'llac'='CADILLAC'
'to get' acts as a link.
Can you help me to learn more?
(Other definitions for cadillac that I've seen before include "Make an acid call for the US car" , "Make acid call to car company" , "American brand of luxury car" , "Car maker" , "Luxury US car" .)