The most common and most likely answer to this crossword clue is the 8 letter word OVERFLOW
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Buddy explains!
The straight part
We know that "It spills" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case it spills = overflow.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 OVERFLOW mean?
OVERFLOW noun- The spillage resultant from overflow; excess.
- Outlet for escape of excess material.
- The situation where a value exceeds the available numeric range.
- To flow over the brim of (a container).
- To cover with a liquid, literally or figuratively.
- To cause an overflow.
- To flow over the edge of a container.
- To exceed limits or capacity.
- To be superabundant; to abound.