Furniture there's room to sit on (3)

I believe the answer is:

bed

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'furniture' is the definition.
(I know that bed is a type of bedroom furniture)

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for bed that I've seen before include "Piece of furniture" , "Place for plants and sleep" , "For sleep and flowers" , "Sleeping place" , "Bottom of the sea or river" .)

I've seen this clue in the Evening Standard.

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