The most common and most likely answer to this crossword clue is the 6 letter word HOARDS
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More clues leading to the result HOARDS
Buddy explains!

The straight part
We know that "moneys accumulated for future use" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case moneys accumulated for future use = hoards.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 HOARDS mean?
HOARDS noun- A hidden supply or fund.
- A cache of valuable objects or artefacts; a trove.
- To amass, usually for one's own private collection.
- A hoarding (temporary structure used during construction).
- A hoarding (billboard).