One closing an incision in the side? (6)
I believe the answer is:
stitch
This clue could be a double definition.
'one closing' is the first definition.
Although both the answer and definition are singular nouns, I can't see how one could define the other.
'incision in the side?' is the second definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Maybe there's a link between them I don't understand?
'an' acts as a link.
Can you help me to learn more?
(Other definitions for stitch that I've seen before include "the tiniest bit of clothing" , "Sudden pain in side after exercise" , "Surgical suture" , "Single loop of needlework" , "closer" .)