The most common and most likely answer to this crossword clue is the 9 letter word PULVERISE
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The straight part
We know that "smash" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case smash = pulverise.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 PULVERISE mean?
PULVERISE verb- To render into dust or powder.
- To completely destroy, especially by crushing to fragments or a powder.
- To defeat soundly, thrash.
- To become reduced to powder; to fall to dust.