Give in, yield (9)
I believe the answer is:
surrender
I believe this is a double definition.
'give in' is the first definition.
(I've seen this before)
'yield' is the second definition.
(yield can mean to give up or surrender)
(Other definitions for surrender that I've seen before include "Yield - release" , "Submit (to an opponent)" , "Capitulate, relinquish" , "submission" , "Concede" .)