Quells argument when last piece is inserted into medical device (10)
I believe the answer is:
peacemaker
'device' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how they can define each other.
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for peacemaker that I've seen before include "Reconciler of enemies" , "mediator" , "'Revolver'" , "Eirenic type" , "Person who reconciles enemies" .)