Give up but accept the contract again? (6)
I believe the answer is:
resign
This clue is a triple definition!
'give up' is the first definition.
(I know that give up can be written as resign)
'but' is a link.
'accept' is the second definition.
(resigning is a kind of accepting)
'the' is a link.
'contract again?' is the third definition.
('sign' is an answer for 'contract' so perhaps 'resign' is OK for 'contract again')
(Other definitions for resign that I've seen before include "advice for the incompetent?" , "Quit" , "Give up position" , "Leave office voluntarily" , "Stand down" .)