Deliver plaster (6)
I believe the answer is:
render
This clue is a double definition.
'deliver' is the first definition.
(I know that deliver can be written as render)
'plaster' is the second definition.
(I know that render is a type of stucco)
(Other definitions for render that I've seen before include "Give brickwork a coat of plaster" , "Depict artistically" , "Substance applied to masonry walls" , "Hand over; plaster" , "Melt fat or perform song" .)