Love affair so ends at last, finding God (4)
I believe the answer is:
eros
'god' is the definition.
(Eros is an example)
'love affair so ends at last' is the wordplay.
'at last' indicates one should take the final letters.
The last letters of 'love affair so ends' are 'EROS'.
'finding' acts as a link.
(Other definitions for eros that I've seen before include "In Greek myth, the god of love" , "Arrow shooter" , "asteroid four hundred and thirty three" , "very centre of London?" , "Form of love" .)