Soften, give in (6)
I believe the answer is:
relent
I believe this clue is a double definition.
'soften' is the first definition.
(I know that soften can be written as relent)
'give in' is the second definition.
(I've seen this before)
(Other definitions for relent that I've seen before include "Ease off" , "Be more lenient, abandon harsh intentions" , "Soften - yield" , "Acquiesce" , "Go easy" .)