Surrender — deny (8)
I believe the answer is:
abnegate
I believe this clue is a double definition.
'surrender' is the first definition.
(I know that abnegate is a more specific form of the action surrender)
'deny' is the second definition.
(abnegating is a kind of denying)
(Other definitions for abnegate that I've seen before include "Disown" , "Refuse" , "Give up or renounce" , "Renounce, reject" , "Formally renounce" .)