The most common and most likely answer to this crossword clue is the 4 plus 4 letter word USED CARS
I've seen this crossword clue in The Guardian
U
S
E
D
C
A
R
S
More clues leading to the result USED CARS
- Crusades staged for models that have been around a bit
- Rovers maybe making itinerant crusades
- Crusades destroyed dodgy salesman’s stock
- Curse sad, dilapidated second-hand vehicles
- Old vehicles, new crusades
- Bangers exploding scared us
- Old wheels recovered from crusades
- Crusades’ wheels? They’re old, but not that old!
Buddy explains!

The straight part
We know that "Old wheels" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case old wheels = used cars.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.