Surrender or relinquish (4)
I believe the answer is:
cede
I believe this is a double definition.
'surrender' is the first definition.
(I know that surrender can be written as cede)
'relinquish' is the second definition.
(I've seen this in another clue)
(Other definitions for cede that I've seen before include "Give up rights or possession" , "Surrender or yield" , "Give up (eg, power)" , "Give away" , "Allow" .)