Couch or bench (4)
I believe the answer is:
seat
'couch or bench' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for seat that I've seen before include "Parliamentary constituency" , "See 10" , "Chair, bench, or stool, say" , "A manner of sitting on horse" , "Horizontal part of a chair" .)