The Crossword Centre Clue-Writing Competition

CCCWC March competition voters’ comments
 
Clue no. 6: Campaigned vigorously for banning silver across the world (8)

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A clue to PANDEMIC.
3 comments refer to this clue (from 3 competitors, 0 others)

Here is the text

Comments on the clue
1.for?
2.Does "for" need to be ignored for the clue to work? Is there such a campaign?
3.'to ban' would work better than 'for banning'