Finish that's rough to the touch (6)

I believe the answer is:

stucco

(Other definitions for stucco that I've seen before include "Fine plaster for moulding into architectural decorations" , "Plaster used on external walls" , "Fine plaster for ornamenting walls etc" , "material for covering wall" , "Decorative external plaster" .)

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

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