Noted export of Portugal (4)

I believe the answer is:

tile

(Other definitions for tile that I've seen before include "Thin slab of fired clay" , "Oblong piece of glazed clay for bathroom wall" , "Thin rectangular slab to cover surfaces" , "Glazed piece of earthenware as for lining walls" , "Thin slab used to cover roof, wall, floor etc" .)

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

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