Complete grade (4)
I believe the answer is:
rank
I believe this clue is a double definition.
'complete' is the first definition.
(thesaurus)
'grade' is the second definition.
('rank' can be a synonym of 'grade')
(Other definitions for rank that I've seen before include "Fetid" , "Social standing; foul-smelling" , "Rotten - row" , "Noisome" , "Stinking" .)