The most common and most likely answer to this crossword clue is the 4 plus 4 letter word SALT AWAY
I've seen this crossword clue in The Guardian
S
A
L
T
A
W
A
Y
More clues leading to the result SALT AWAY
Buddy explains!

The straight part
We know that "to hoard" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case to hoard = salt away.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.