Everything one owns ending in garbage, say (6)
I believe the answer is:
estate
'everything one owns' is the definition.
(I've seen this before)
'ending in garbage say' is the wordplay.
'ending in' suggests the final letters.
'say' becomes 'state' ('state' can be a synonym of 'say').
The last letter of 'garbage' is 'e'.
'e'+'state'='ESTATE'
(Other definitions for estate that I've seen before include "Piece of land with a large house or many small ones" , "park perhaps" , "Place for tea or coffee" , "Area of landed property" , "Property to be inherited" .)