Copper cost is crazy. Get plaster (6)

I believe the answer is:

stucco

I'm a little stuck... Click here to teach me more about this clue!

'plaster' is the definition.
(I know that plaster can be written as stucco)

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for stucco that I've seen before include "Mouldable wall plaster" , "Plaster used to coat walls" , "Plaster for coating exterior walls" , "Plaster used for decorative moulding" , "Plaster used for moulding decorations on walls or ceilings" .)

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

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