End of affaire, say, giving grounds (6)
I believe the answer is:
estate
'grounds' is the definition.
(I've seen this before)
'end of affaire say' is the wordplay.
'end of' indicates one should take the final letters.
'say' becomes 'state' ('state' can be a synonym of 'say').
The final letter of 'affaire' is 'e'.
'e'+'state'='ESTATE'
'giving' is the link.
(Other definitions for estate that I've seen before include "all the deceased owned" , "The whole of one's possessionsat death" , "My wealth" , "Tea-set (anag.)" , "Property to be inherited" .)