Possible car’s ultimately ramshackle condition (6)
I believe the answer is:
estate
'possible car's' is the definition.
'estate' can be an answer for 'car's' (type of car). I'm unsure of the 'possible' bit.
'ultimately ramshackle condition' is the wordplay.
'ultimately' indicates one should take the final letters.
'condition' becomes 'state' (the state something is in).
The final letter of 'ramshackle' is 'e'.
'e'+'state'='ESTATE'
Can you help me to learn more?
(Other definitions for estate that I've seen before include "One car" , "One's property after death" , "Follow on" , "Rank - housing development - car" , "Scheme of new housing" .)