Oil from car, until changed, black inside (9)
I believe the answer is:
lubricant
'oil' is the definition.
(I've seen this before)
'car until changed black inside' is the wordplay.
'changed' is an anagram indicator.
'black' becomes 'b' (as in pencil classifications).
'inside' is an insertion indicator.
'car'+'until'='caruntil'
'caruntil' with letters rearranged gives 'luricant'.
'luricant' placed around 'b' is 'LUBRICANT'.
'from' acts as a link.
(Other definitions for lubricant that I've seen before include "E.g. oil" , "Oil, for example" , "What might have you well oiled" , "Oil or grease" , "Substance reducing friction" .)