Stitched up? (5)

I believe the answer is:

sewed

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This might be a double definition.

'stitched' is the first definition.
('sew' can be a synonym of 'stitch')

'up?' is the second definition.
Both the definition and answer are adjectives. Maybe there's a link between them I don't understand?

Can you help me to learn more?

(Other definitions for sewed that I've seen before include "Did needlework" , "Stitched" , "Joined" , "Darned" , "Used needle and thread" .)

I've seen this clue in the Evening Standard.

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