Crossword Genius

When depravity raves about? Just the opposite! (4,5)

Ross

I believe the answer is:

vice versa

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

'just the opposite' is the definition.
(I've seen this before)

'when depravity raves about?' is the wordplay.
I cannot really understand how this works, but
'when' could be 'e' (I've seen this in other clues) and 'e' is located in the answer.
an anagram of 'raves' is 'versa' which is located in the answer.
'about?' could be 'c' (abbreviation for 'circa') and 'c' is present in the answer.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for vice versa that I've seen before include "film" , "Revise a VC? (anag)" , "In reverse order" , "The other way around" , "The opposite (also applies)" .)

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