Series of poems by Edith Sitwell set to music by William Walton in an "entertainment" first performed in public in 1923 (6)

I believe the answer is:

facade

(Other definitions for facade that I've seen before include "Front; work by Walton" , "Deceptive outward appearance" , "Walton's setting of Sitwell's verses" , "Front-of-house" , "Outward appearance like front of building" .)

I've seen this clue in The Independent.

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