They wreck VW boots (6-8)

I believe the answer is:

beetle-crushers

I'm a little stuck... Click here to teach me more about this clue!

'they wreck' is the definition.
I know nothing about this answer so I can't judge whether it can be defined by this definition.

'vw boots' is the wordplay.
'vw' becomes 'beetle' (I've seen this in another clue).
'boots' becomes 'crushers' (I can't justify this - if you can you should believe this answer much more).
'beetle'+'crushers'='BEETLE-CRUSHERS'

Can you help me to learn more?

I've seen this clue in the Sydney Morning Herald.

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