Equal, notwithstanding (4)
I believe the answer is:
even
I believe this clue is a double definition.
'equal' is the first definition.
('even' can be similar in meaning to 'equal')
'notwithstanding' is the second definition.
(thesaurus)
(Other definitions for even that I've seen before include "happening to take time off?" , "Constant" , "Level, straight or regular" , "Quits - flat" , "Plumb" .)