Show what across answers are doing? (8,3)

I believe the answer is:

breaking bad

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

'show what across answers' is the definition.
I don't know anything about this answer so I cannot tell whether this works.

'are doing?' is the wordplay.
I cannot quite understand how this works, but
an anagram of 'are' is 'rea' which is located in the answer.
This explanation may well be incorrect...

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I've seen this clue in The Independent.

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