A mixture of mural work (6)

I believe the answer is:

stucco

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'work' is the definition.
(I have seen 'decorative work' mean 'stucco' so perhaps 'work' could also mean 'stucco')

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for stucco that I've seen before include "Decorative wall coating" , "Mixture for decorative use on buildings" , "Plaster for coating or moulding" , "Fine type of plaster" , "Plaster for coating exterior walls" .)

I've seen this clue in the Evening Standard.

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