Can court after former partner's gone (7)
I believe the answer is:
extinct
'gone' is the definition.
(I've seen this before)
'can court after former partner's' is the wordplay.
'can' becomes 'tin' ('tin' can be a synonym of 'can').
'court' becomes 'ct'.
'after' says to put letters next to each other.
'former partner' becomes 'ex'.
'tin'+'ct'='tinct'
'tinct' after 'ex' is 'EXTINCT'.
(Other definitions for extinct that I've seen before include "Having died out, like the dinosaur" , "never to be seen again" , "No longer living, like dinosaur" , "Wiped out" , "(Of species) no longer living" .)