Crossword Genius

Clay square (4)

Ross

I believe the answer is:

tile

(Other definitions for tile that I've seen before include "Ceramic rectangle" , "Thin slab of ceramic or slate" , "Thin rectangular slab to cover surfaces" , "Small slab of baked clay for covering walls, roofs etc" , "Oblong piece of glazed clay for bathroom wall" .)

I've seen this clue in the Penny Press.
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