Sharp spasmodic pain from a suture (6)
I believe the answer is:
stitch
This clue might be a double definition.
'sharp spasmodic pain' is the first definition.
'stitch' can be an answer for 'pain' (pain in the body). I'm not sure about the 'sharp spasmodic' bit.
'a suture' is the second definition.
(I've seen this in another clue)
'from' acts as a link.
Can you help me to learn more?
(Other definitions for stitch that I've seen before include "Loop of thread" , "It's painful" , "Darn" , "One's in time to save eight others" , "Pain caused by running" .)