Having made a valid will (7)
I believe the answer is:
testate
'having made a valid will' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for testate that I've seen before include "Having left valid will at death" , "Having made a will before death" , "Dying with a will" , "State of having made a will" , "Having written a valid will" .)