A 'swish' feature of decor? (7)

I believe the answer is:

curtain

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'decor?' is the definition.
(thesaurus)

I can't explain the remainder of the clue.

(Other definitions for curtain that I've seen before include "Hanging, window cover" , "Fabric window covering" , "Window material" , "Hanging fabric" , "Hanging material screen" .)

I've seen this clue in the Evening Standard.

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