Go back and make a further concession? (6)
I believe the answer is:
recede
'go back' is the definition.
(I've seen this before)
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for recede that I've seen before include "Withdraw" , "Move backward" , "Decline" , "Become more distant" , "Start balding" .)