The most common and most likely answer to this crossword clue is the 8 letter word HEIRLOOM
I've seen this crossword clue in The Daily Telegraph
H
E
I
R
L
O
O
M
More clues leading to the result HEIRLOOM
- That girl’s tower contains one item that’s been in thefamily for years
- Valuable family piece the man and I left in vault?
- Atmosphere heard to hang over family treasure
- Irish diplomat, first to threaten ancestral property
- Hire mobile toilet before beginning of May for part of estate
- Hire broken machine that’s regularly passed on
- It’s inherited by John after he goes to Ireland to get married
- Item handed down from extremely humble Irish weaver?
- What’s passed down line when person in possession passes?
- New home in which Irish look to have inherited item
Buddy explains!

The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does HEIRLOOM mean?
HEIRLOOM noun- A valued possession that has been passed down through the generations.
- An old crop variety that has been passed down through generations of farmers by seed saving and cultivation, in contrast to modern cultivars used in large-scale agriculture.