Family treasure (8)
I believe the answer is:
heirloom
'family treasure' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for heirloom that I've seen before include "Valuable family object" , "Valuable item still in family" , "Cherished item passed down through generations" , "something passed on" , "Hand-me-down" .)