Everything you own's in base condition (6)
I believe the answer is:
estate
'everything you own's' is the definition.
(I've seen this before)
'base condition' is the wordplay.
'base' becomes 'e' (I've seen this in other clues).
'condition' becomes 'state' (I've seen this before).
'e'+'state'='ESTATE'
'in' is the link.
(Other definitions for estate that I've seen before include "All money and property owned at time of death" , "Possessions at the time of death" , "Piece of land with a lot of houses" , "Person's belongings after death" , "What you leave when you die" .)