The most common and most likely answer to this crossword clue is the 10 letter word TREASURIES
I've seen this crossword clue in The Guardian
T
R
E
A
S
U
R
I
E
S
Buddy explains!
The straight part
We know that "Those storing money" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case those storing money = treasuries.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 TREASURIES mean?
TREASURIES noun- A place where treasure is stored safely.
- A place where state or royal money and valuables are stored.
- A collection of artistic or literary works.
- A treasure.
- A government department that manages government finances.