Crossword Genius

Was criterion changed? Just the opposite (12)

Ross

I believe the answer is:

contrariwise

'the opposite' is the definition.
(thesaurus)

'was criterion changed?' is the wordplay.
'changed?' is an anagram indicator.
'was'+'criterion'='wascriterion'
'wascriterion' is an anagram of 'CONTRARIWISE'.

'just' acts as a link.

I've seen this clue in The Times.
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