Cuter form of armistice (5)
I believe the answer is:
truce
'armistice' is the definition.
(I know that armistice can be written as truce)
'cuter form' is the wordplay.
'form' indicates an anagram (another form of the letters).
'cuter' is an anagram of 'TRUCE'.
'of' is the link.
(Other definitions for truce that I've seen before include "Cuter (anag.)" , "Temporary ceasefire" , "Suspension of hostilities" , "Agreement to stop battle" , "Peace agreement" .)