One breaks into old Vauxhall, suspect reptile found here? (8)

I believe the answer is:

vivarium

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'one breaks into old vauxhall suspect reptile found here?' is the definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.

This is all the clue.

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(Another definition for vivarium that I've seen is " does this provide good conditions for liver?".)

I've seen this clue in The Telegraph.

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