Nevertheless, still (3)
I believe the answer is:
but
I believe this clue is a double definition.
'nevertheless' is the first definition.
(I've seen this before)
'still' is the second definition.
(both can mean nonetheless or even so)
(Other definitions for but that I've seen before include "Only; apart from" , "SECOND PART OF 10" , "Only in attribution" , "Save" , "Nevertheless, on the other hand" .)