Crossword Genius

Bit of a subway station wall (4)

Ross

I believe the answer is:

tile

(Other definitions for tile that I've seen before include "Thin slab used to cover roof, wall, floor etc" , "Scrabble piece" , "Flat piece of ceramic" , "Hat" , "Roofing material" .)

I've seen this clue in The New York Times.
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