Sort of total slang comes eventually (2,4,4)
I believe the answer is:
at long last
'eventually' is the definition.
(I've seen this before)
'sort of total slang' is the wordplay.
'sort of' indicates anagramming the letters.
'total'+'slang'='totalslang'
'totalslang' anagrammed gives 'AT LONG LAST'.
'comes' acts as a link.
(Other definitions for at long last that I've seen before include "After much delay" , "repairing the biggest shoes?" , "Eventually" , "cobbling size seventeens?" , "producing larger shoes?" .)