Boxsprings

2 clues
They support sleepers
What Brits call "divans
Similar answers:
Airings
Alicesprings
Alltheringsmen
Apnstrings
Apronstrings
Apronstringsfat
Astrings
Ballbearings
Balletbearings
Barberingstrait
Barings
Baringsbank
Baringsides
Bearings
Bedsprings
Bellrings
Beringsea
Beringstrait
Betteredherrings
Bickeringsea