Some godsend Ivor celebrated in Split (7)
I believe the answer is:
divorce
'split' is the definition.
(split can mean a divorce)
'some godsend ivor celebrated' is the wordplay.
'some' says the answer is hidden in the clue (some of the parts of the word are used).
'DIVORCE' is hidden within 'godsend ivor celebrated'.
'in' is the link.
(Other definitions for divorce that I've seen before include "Get separated" , "Legal end to a marriage" , "Permanent separation" , "End one's marriage" , "Part" .)