To sum up, surrender again? (12)
I believe the answer is:
recapitulate
I believe this clue is a double definition.
'to sum up' is the first definition.
(recapitulating is a kind of summing up)
'surrender again?' is the second definition.
('capitulate' is an answer for 'surrender' so perhaps 'recapitulate' is OK for 'surrender again')
(Other definitions for recapitulate that I've seen before include "Go over in summary" , "Go over the main points again" , "Sum up" , "go over old ground" , "Repeat in summary" .)