The most common and most likely answer to this crossword clue is the 8 letter word BROUGHAM
I've seen this crossword clue in The Daily Telegraph
B
R
O
U
G
H
A
M
More clues leading to the result BROUGHAM
- Old car cleaner, you might say
- Carriage fetched, losing little time in the morning
- Rude to stuff fairy queen back in carriage
- What sounds like something for cleaning old carriage
- Doctor upset carrying hooligan by a carriage
- Horse-drawn coach makes bishop rather unwell by morning
- Rough inside second-rate American carriage
- Horse-drawn carriage cleaner would you say?
Buddy explains!

The straight part
We know that "carriage" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case carriage = brougham.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 BROUGHAM mean?
BROUGHAM noun- A four-wheeled horse-drawn carriage, designed in 1839. It had an open seat for the driver in front of the closed cabin for two or four passengers.
- An automobile, a sedan without a roof over the driver's seat.