Swede shattered when stitched up (5)
I believe the answer is:
sewed
'stitched up' is the definition.
'sewed' can be an answer for 'stitched' ('sew' can be a synonym of 'stitch'). I am not sure about the 'up' bit.
'swede shattered' is the wordplay.
'shattered' is an anagram indicator.
'swede' anagrammed gives 'SEWED'.
'when' acts as a link.
Can you help me to learn more?
(Other definitions for sewed that I've seen before include "Darned" , "Did needlework" , "Stitched" , "Joined" , "Used needle and thread" .)