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Ants do not eat black fly-they farm aphids for the secretions that the aphids produce.
The spray- if used correctly should not turn the leaves brown-that may be a sign of another unrelated problem.
Might be too dry?-a fungal attack?-where exactly is it? -against a wall/fence?
May be too dry in that case-keep moist and apply a thick mulch-that should help.
if you grow nasturtiums next to the clematis ,the black fly should go to them instead,also try a garlic spray.