Fine plaster for architectural decoration (6)

I believe the answer is:

stucco

(Other definitions for stucco that I've seen before include "Plaster for coating outside walls" , "Fine plaster for ornamenting walls etc" , "White plaster covering for exterior walls" , "Mouldable wall plaster" , "Fine plaster used in cornices, mouldings" .)

I've seen this clue in The Irish Times.

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