Ring again and cancel (6)
I believe the answer is:
repeal
I believe this clue is a double definition.
'ring again' is the first definition.
('peal' is an answer for 'ring' so perhaps 'repeal' is OK for 'ring again')
'cancel' is the second definition.
(repealing is a kind of cancelling)
'and' is the link.
(Other definitions for repeal that I've seen before include "reverse" , "Annul by legislative action" , "reversal of act" , "Annul an act of parliament" , "'Annul, revoke (6)'" .)