Basically, the shop has one (5)

I believe the answer is:

floor

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'shop has one' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Maybe they are linked in a way I don't understand?

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for floor that I've seen before include "at bottom of forest" , "Minimum (price) level" , "Inside horizontal surface" , "Sea bottom; baffle" , "Stump" .)

I've seen this clue in the Evening Standard.

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