Everything but a complete porker (5,3)
I believe the answer is:
whole hog
'everything' is the definition.
(I've seen this in another clue)
'a complete porker' is the wordplay.
'a complete' becomes 'whole' (I've seen this in another clue).
'porker' becomes 'hog' (I've seen this in another clue).
'whole'+'hog'='WHOLE-HOG'
'but' is the link.
(Other definitions for whole hog that I've seen before include "(Go it) all the way" , "Go the . . . . . . . .; give it everything, being a complete pig" , "Go the ---: be fully committed" .)