Crossword Genius

Hotel bill picked up by friend, mostly? One's floored! (4,3)

Ross

I believe the answer is:

bath mat

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'one's floored' is the definition.
(a bath mat goes on the floor)

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for bath mat that I've seen before include "One may stand on it wet" , "Rug alongside washing facility" , "One may be floored" , "it may get wet after a shower" , "It keeps moisture off the floor" .)

I've seen this clue in The Independent.
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