Roomy auto (5)
I believe the answer is:
sedan
'roomy auto' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for sedan that I've seen before include "Chair to be carried by two" , "Palanquin; car" , "Dean's in an old conveyance" , "Old carrier chair for Danes" , "big chair" .)