The most common and most likely answer to this crossword clue is the 9 letter word STOCKPILE
I've seen this crossword clue in The Daily Telegraph
S
T
O
C
K
P
I
L
E
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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 STOCKPILE mean?
STOCKPILE noun- A supply, especially a large one, of something kept for future use.
- To accumulate a stockpile.