Couch, sofa (6)
I believe the answer is:
settee
This clue is a double definition.
'couch' is the first definition.
(I know that settee is a type of couch)
'sofa' is the second definition.
(I know that settee is a type of sofa)
(Other definitions for settee that I've seen before include "somewhere to sit" , "Comfortable seat for two or more" , "Sofa, couch" , "Item of furniture" , "Long upholstered seat with a back" .)