Cuter sort of armistice (5)
I believe the answer is:
truce
'armistice' is the definition.
(I know that armistice can be written as truce)
'cuter sort' is the wordplay.
'sort' indicates an anagram.
'cuter' is an anagram of 'TRUCE'.
'of' acts as a link.
(Other definitions for truce that I've seen before include "Temporary cessation of hostilities" , "Cruet (anag.)" , "Cessation of hostilities to allow peace talks" , "Cuter (anag.)" , "halt in fighting" .)