Girl ringing home for forgiveness (7)
I believe the answer is:
amnesty
'forgiveness' is the definition.
(I've seen this before)
'girl ringing home' is the wordplay.
'girl' becomes 'amy'.
'ringing' indicates putting letters inside.
'home' becomes 'nest' (I've seen this before).
'amy' placed around 'nest' is 'AMNESTY'.
'for' is the link.
(Other definitions for amnesty that I've seen before include "General pardon for crimes against the state" , "General pardon - international charity" , "Legal pardon" , "International organisation concerned with human rights" , "A general pardon as for rebels (7)" .)