The most common and most likely answer to this crossword clue is the 11 letter word ACCELERATES
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Buddy explains!
The straight part
We know that "Snowballs" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case snowballs = accelerates.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 ACCELERATES mean?
ACCELERATES verb- To cause to move faster; to quicken the motion of; to add to the speed of.
- To quicken the natural or ordinary progression or process of.
- To cause a change of velocity.
- To hasten, as the occurrence of an event.
- To enable a student to finish a course of study in less than normal time.
- To become faster; to begin to move more quickly.
- Grow; increase.