The most common and most likely answer to this crossword clue is the 5 letter word CACHE
I've seen this crossword clue in The Guardian
C
A
C
H
E
More clues leading to the result CACHE
Buddy explains!

The straight part
We know that "Hoard" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case hoard = cache.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 CACHE mean?
CACHE noun- A store of things that may be required in the future, which can be retrieved rapidly, protected or hidden in some way.
- A fast temporary storage where recently or frequently used information is stored to avoid having to reload it from a slower storage medium.
- (geocaching) A container containing treasure in a global treasure-hunt game.
- To place in a cache.