The most common and most likely answer to this crossword clue is the 10 letter word RESERVOIRS
I've seen this crossword clue in The Guardian
R
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Buddy explains!

The straight part
We know that "funds" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case funds = reservoirs.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 RESERVOIRS mean?
RESERVOIRS noun- A place where anything is kept in store
- A large natural or artificial lake used as a source of water supply.
- A small intercellular space, often containing resin, essential oil, or some other secreted matter.
- A supply or source of something.
- A species that acts as host to a zoonosis when it is not causing acute illness in other susceptible species.