Plaster for walls made from Portland cement, sand and lime (6)

I believe the answer is:

stucco

(Other definitions for stucco that I've seen before include "Coating material" , "Plaster used for moulding and decorating" , "Decorative wall coating" , "Fine decorative plaster" , "Kind of plaster used for wall decoration" .)

I've seen this clue in The Guardian.

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