No longer around, former partner can go to court (7)
I believe the answer is:
extinct
'no longer around' is the definition.
(I've seen this before)
'former partner can go to court' is the wordplay.
'former partner' becomes 'ex'.
'can' becomes 'tin' ('tin' can be a synonym of 'can').
'go to' is a charade indicator (letters next to each other).
'court' becomes 'ct'.
'ex'+'tin'+'ct'='EXTINCT'
(Other definitions for extinct that I've seen before include "No more vital" , "No linger in existence" , "No longer erupting" , "No longer around" , "(Of a volcano) dead" .)