Copper cost is crazy so get plaster (6)

I believe the answer is:

stucco

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'plaster' is the definition.
(I know that stucco is a type of plaster)

I don't understand the rest of the clue.

(Other definitions for stucco that I've seen before include "Kind of plaster used for wall decoration" , "Plaster used for moulding decorations on walls or ceilings" , "Plaster for coating or moulding" , "Mouldable wall plaster" , "Fine plaster used on wall surfaces" .)

I've seen this clue in The Globe and Mail.

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