The most common and most likely answer to this crossword clue is the 7 letter word DAIMLER
D
A
I
M
L
E
R
More clues leading to the result DAIMLER
- Old engineer's design left during communist revolt
- Welsh lad has mulberry regularly
- Ambition followed by inexperienced driver in the German car
- Steer left in the German car
- Initially delighted US writer marks down classic car
- Train learner in the German car
- Car takes winding mile in winding road — nothing to be lost
Buddy explains!

The straight part
We know that "classic car" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case classic car = daimler.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.