A case for a sempstress (4)

I believe the answer is:

etui

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'a case' is the definition.
(case for needlework equipment)

I can't explain the remainder of the clue.

(Other definitions for etui that I've seen before include "box" , "Small case for small articles" , "Tiny ladies' bag" , "Small needle case e" , "Case containing sharp objects" .)

I've seen this clue in The Irish News.

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