Carry on after all (4)
I believe the answer is:
last
This clue is a double definition.
'carry on' is the first definition.
(thesaurus)
'after all' is the second definition.
(I've seen this in another clue)
(Other definitions for last that I've seen before include "model for a leprechaun" , "stay at the back" , "Form on which a shoe is made" , "Final; endure" , "Rearmost" .)