It joins in operations (6)

I believe the answer is:

suture

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'it joins in operations' is the definition.
The definition suggests a singular noun which matches the answer.

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(Other definitions for suture that I've seen before include "Surgical stitch in uterus" , "Medical stitch" , "Material for sewing a wound" , "part of the healing process?" , "Thread for sewing up wound" .)

I've seen this clue in The Globe and Mail.

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