The most common and most likely answer to this crossword clue is the 9 letter word GAVELKIND
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Buddy explains!
The straight part
We know that "all get a share in it" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case all get a share in it = gavelkind.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 GAVELKIND mean?
GAVELKIND noun- A system of inheritance associated with the county of Kent in England whereby, at the death of a tenant, intestate estate is divided equally among all his sons; also, a similar system employed in Ireland