Trim a table with a rug (3)
I believe the answer is:
'a rug' is the definition.
(both are floor coverings)
'trim a table with' is the wordplay.
'with' indicates a hidden word.
'MAT' is hidden in the letters of 'trim a table'.
(Other definitions for mat that I've seen before include "Rough piece of floor-covering" , "Thick flat pad on the floor" , "coaster" , "Paint with a dull surface" , "What the cat sat on?" .)