Being stitched up makes little difference to Sean (4)

I believe the answer is:

sewn

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'being stitched' is the definition.
('sewn' can be a synonym of 'stitched')

I cannot understand how the rest of the clue works.

(Other definitions for sewn that I've seen before include "Darned" , "Run up" , "Joined with stitches" , "Made as garment" , "Stitched" .)

I've seen this clue in the Evening Standard.

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