Relinquish legally (4)
I believe the answer is:
cede
'relinquish legally' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for cede that I've seen before include "Surrender or yield" , "Allow" , "Surrender or grant" , "Give up one's rights" , "Give up (power to another)" .)