Hotel bill picked up by friend, mostly? One's floored! (4,3)
I believe the answer is:
bath mat
'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" .)