Decorative plaster (6)
I believe the answer is:
stucco
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">decorative plaster</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for stucco that I've seen before include "Plaster used to coat walls" , "Type of plastering for outside walls" , "Kind of plaster moulded into decorations" , "Plaster used for moulding decorations on walls or ceilings" , "Fine plaster used in cornices, mouldings" .)