An American saloon (5)
![Ross](/clue/static/ross-mug.min.png)
I believe the answer is:
sedan
'an american saloon' is the definition.
(US term for a saloon car)
This is all the clue.
(Other definitions for sedan that I've seen before include "Enclosed chair" , "Saloon car (US)" , "Chair used as transport" , "Andes (anag.)" , "American car" .)