Military truce (9)
I believe the answer is:
armistice
'military truce' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for armistice that I've seen before include "End of hostilities" , "harbinger of peace?" , "Cease-fire in order to conduct talks" , "Fire is prevented by this" , "let-up from war" .)