The most common and most likely answer to this crossword clue is the 5 letter word SEDAN
I've seen this crossword clue in The Daily Telegraph
S
E
D
A
N
More clues leading to the result SEDAN
- Movable chair some used anywhere
- Extremely sore martial artist finds chair
- Chair in an American saloon
- . Witnessed animal bearing litter
- Means of transport for Home Counties judoka
- Irishman grabbing daughter’s car
- Litter in saloon
- Danse macabre in saloon
- Media executive enters medical facility in large car
- Old-fashioned means of transport for one upwardly mobile
Buddy explains!

The straight part
We know that "Old-fashioned means of transport for one upwardly mobile" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case old-fashioned means of transport for one upwardly mobile = sedan.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 SEDAN mean?
SEDAN noun- An enclosed windowed chair suitable for a single occupant, carried by at least two porters, in equal numbers in front and behind, using wooden rails that passed through metal brackets on the sides of the chair.
- An automobile designed in a configuration with separate compartments for engine space, driver/passenger space and luggage space.
- A handbarrow for transporting fish.