1930s art right for interior design? (5)

I believe the answer is:

decor

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'interior design?' is the definition.
(I've seen this before)

I cannot understand how the rest of the clue works.

(Other definitions for decor that I've seen before include "Internal ornamentation" , "Style of furnishings, drapes etc used in a room" , "furnishings required" , "Choice of colour" , "(Room) design" .)

I've seen this clue in the Sydney Morning Herald.

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