The most common and most likely answer to this crossword clue is the 8 letter word STILLAGE
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The straight part
We know that "Stand for casks" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case stand for casks = stillage.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 STILLAGE mean?
STILLAGE noun- The residue from the manufacture of alcohol from grain; typically used in animal feed
- A rack or pallet used to hold goods (originally casks) off the floor