Zero call for an end to change, finally (4,3,3,3)
I believe the answer is:
once and for all
'finally' is the definition.
(I've seen this before)
'zero call for an end to change' is the wordplay.
'zero' becomes 'o'.
'to change' indicates anagramming the letters.
'call'+'for'+'an'+'end'='callforanend'
'callforanend' with letters rearranged gives 'nceandforall'.
'o'+'nceandforall'='ONCE AND FOR ALL'
(Other definitions for once and for all that I've seen before include "unique public statement?" , "Finally" , "Decisively" , "how might an inclusively unique show be performed?" , "In a conclusive way" .)