Not having planned to leave? (9)
I believe the answer is:
intestate
'not having planned to leave?' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for intestate that I've seen before include "One without will" , "Not having planned to leave" , "not prepared to leave" , "Dying thus, one leaves no will" , "Lacking a will" .)