Cement or plaster coating for exterior walls (6)

I believe the answer is:

stucco

(Other definitions for stucco that I've seen before include "Mixture for decorative use on buildings" , "Outer layer" , "Durable finish for walls" , "Plaster for coating or moulding" , "Plaster for decorative work" .)

I've seen this clue in the Sydney Morning Herald.

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