Cuter form of ceasefire (5)
I believe the answer is:
truce
'ceasefire' is the definition.
(I know that truce is a type of ceasefire)
'cuter form' is the wordplay.
'form' indicates anagramming the letters (another form of the letters).
'cuter' anagrammed gives 'TRUCE'.
'of' is the link.
(Other definitions for truce that I've seen before include "Cuter (anag.)" , "Temporary pause in war" , "Cessation of hostilities to allow peace talks" , "move towards permanent peace" , "Cruet (anag.)" .)