Together nevertheless (2,3,4,4)
I believe the answer is:
at the same time
This clue is a double definition.
'together' is the first definition.
(synonyms)
'nevertheless' is the second definition.
(I know this)
(Other definitions for at the same time that I've seen before include "Coincidentally - still - however" , "together" , "nonetheless" , "Notwithstanding" , "on the other hand" .)