They join together in operations (8)
I believe the answer is:
stitches
'operations' is the definition.
The answer and definition can be both states of affairs as well as being plural nouns.
Perhaps you can see an association between them that I can't see?
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for stitches that I've seen before include "Sharp pains in the side caused by running" , "Sharp spasms of pain in the side" , "Loops made by needle and thread" , "Sewing links, loops or knots" , "Spasms of pain, caused by needles?" .)