Fine plaster (6)
I believe the answer is:
stucco
'fine plaster' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for stucco that I've seen before include "Plaster for decorative work" , "Durable finish for walls" , "Fine plaster for moulding into architectural decorations" , "Fine type of plaster" , "Kind of plaster moulded into decorations" .)