Crossword Genius

Opponent to reform in handling of subtractions? (12)

Ross

I believe the answer is:

obscurantist

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'opponent to reform in handling' is the definition.
I can't judge whether this defines the answer.

'of subtractions?' is the wordplay.
'of' is an anagram indicator (the answer comes from or 'of' the letters).
'subtractions' with letters rearranged gives 'OBSCURANTIST'.

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I've seen this clue in The Independent.
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