The most common and most likely answer to this crossword clue is the 8 letter word DUSTCART
I've seen this crossword clue in The Guardian
D
U
S
T
C
A
R
T
More clues leading to the result DUSTCART
Buddy explains!
The straight part
We know that "Collectors’ vehicle" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case collectors’ vehicle = dustcart.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.
What does DUSTCART mean?
DUSTCART noun- A vehicle for collecting refuse.